NURL and Prebid win event were fired twice

[elq81hc]

Describe the bug
NURL and Prebid win event endpoint were fired twice

To Reproduce
Steps to reproduce the behavior:

1. On Prebid server, enable event endpoint
2. On mobile side, run example InAppDisplayBanner320x50Activity on simulator

Expected behavior
The NURL and Prebid win event endpoint should be fired only once.

Additional context
SDK version: 2.3.1
I have traced the call stack, it seems the events are triggered by WinNotifier 2 times, the first time is from DisplayView and the second time is from PrebidDisplayView
The first time

"main@25602" prio=5 tid=0x2 nid=NA runnable
  java.lang.Thread.State: RUNNABLE
	  at org.prebid.mobile.rendering.networking.WinNotifier.sendNextWinRequest(WinNotifier.java:124)
	  at org.prebid.mobile.rendering.networking.WinNotifier.sendNextWinRequest(WinNotifier.java:119)
	  at org.prebid.mobile.rendering.networking.WinNotifier.notifyWin(WinNotifier.java:104)
	  at org.prebid.mobile.api.rendering.DisplayView.createBannerAdView(DisplayView.java:78)
	  at org.prebid.mobile.api.rendering.DisplayView.<init>(DisplayView.java:70)
	  at org.prebid.mobile.api.rendering.BannerView.displayPrebidView(BannerView.java:635)
	  at org.prebid.mobile.api.rendering.BannerView.-$$Nest$mdisplayPrebidView(BannerView.java:-1)
	  at org.prebid.mobile.api.rendering.BannerView$4.onPrebidSdkWin(BannerView.java:201)
	  at org.prebid.mobile.rendering.bidding.interfaces.StandaloneBannerEventHandler.requestAdWithBid(StandaloneBannerEventHandler.java:38)
	  at org.prebid.mobile.api.rendering.BannerView$3.onFetchCompleted(BannerView.java:178)
	  at org.prebid.mobile.rendering.bidding.loader.BidLoader$1.onResponse(BidLoader.java:67)
	  at org.prebid.mobile.rendering.networking.BaseNetworkTask.onPostExecute(BaseNetworkTask.java:120)
	  at org.prebid.mobile.rendering.networking.BaseNetworkTask.onPostExecute(BaseNetworkTask.java:49)
	  at android.os.AsyncTask.finish(AsyncTask.java:771)
	  at android.os.AsyncTask.-$$Nest$mfinish(AsyncTask.java:-1)
	  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:788)
	  at android.os.Handler.dispatchMessage(Handler.java:107)
	  at android.os.Looper.loopOnce(Looper.java:232)
	  at android.os.Looper.loop(Looper.java:317)
	  at android.app.ActivityThread.main(ActivityThread.java:8705)
	  at java.lang.reflect.Method.invoke(Method.java:-1)
	  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:580)
	  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:886)

The second time

"main@25602" prio=5 tid=0x2 nid=NA runnable
  java.lang.Thread.State: RUNNABLE
	  at org.prebid.mobile.rendering.networking.WinNotifier.sendNextWinRequest(WinNotifier.java:124)
	  at org.prebid.mobile.rendering.networking.WinNotifier.sendNextWinRequest(WinNotifier.java:119)
	  at org.prebid.mobile.rendering.networking.WinNotifier.notifyWin(WinNotifier.java:104)
	  at org.prebid.mobile.api.rendering.PrebidDisplayView.<init>(PrebidDisplayView.java:182)
	  at org.prebid.mobile.api.rendering.PrebidRenderer.createBannerAdView(PrebidRenderer.java:76)
	  at org.prebid.mobile.api.rendering.DisplayView.lambda$createBannerAdView$0(DisplayView.java:82)
	  at org.prebid.mobile.api.rendering.DisplayView.$r8$lambda$D1_Mda70ZiTOCujvL5aj2DZf9q8(DisplayView.java:-1)
	  at org.prebid.mobile.api.rendering.DisplayView$$ExternalSyntheticLambda0.onResult(D8$$SyntheticClass:-1)
	  at org.prebid.mobile.rendering.networking.WinNotifier.sendNextWinRequest(WinNotifier.java:111)
	  at org.prebid.mobile.rendering.networking.WinNotifier.sendNextWinRequest(WinNotifier.java:125)
	  at org.prebid.mobile.rendering.networking.WinNotifier.sendNextWinRequest(WinNotifier.java:119)
	  at org.prebid.mobile.rendering.networking.WinNotifier.notifyWin(WinNotifier.java:104)
	  at org.prebid.mobile.api.rendering.DisplayView.createBannerAdView(DisplayView.java:78)
	  at org.prebid.mobile.api.rendering.DisplayView.<init>(DisplayView.java:70)
	  at org.prebid.mobile.api.rendering.BannerView.displayPrebidView(BannerView.java:635)
	  at org.prebid.mobile.api.rendering.BannerView.-$$Nest$mdisplayPrebidView(BannerView.java:-1)
	  at org.prebid.mobile.api.rendering.BannerView$4.onPrebidSdkWin(BannerView.java:201)
	  at org.prebid.mobile.rendering.bidding.interfaces.StandaloneBannerEventHandler.requestAdWithBid(StandaloneBannerEventHandler.java:38)
	  at org.prebid.mobile.api.rendering.BannerView$3.onFetchCompleted(BannerView.java:178)
	  at org.prebid.mobile.rendering.bidding.loader.BidLoader$1.onResponse(BidLoader.java:67)
	  at org.prebid.mobile.rendering.networking.BaseNetworkTask.onPostExecute(BaseNetworkTask.java:120)
	  at org.prebid.mobile.rendering.networking.BaseNetworkTask.onPostExecute(BaseNetworkTask.java:49)
	  at android.os.AsyncTask.finish(AsyncTask.java:771)
	  at android.os.AsyncTask.-$$Nest$mfinish(AsyncTask.java:-1)
	  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:788)
	  at android.os.Handler.dispatchMessage(Handler.java:107)
	  at android.os.Looper.loopOnce(Looper.java:232)
	  at android.os.Looper.loop(Looper.java:317)
	  at android.app.ActivityThread.main(ActivityThread.java:8705)
	  at java.lang.reflect.Method.invoke(Method.java:-1)
	  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:580)
	  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:886)