fixed ordering of log message

Signed-off-by: Matt Peterson <[email protected]>

Author: mattp-swirldslabs

server/src/main/java/com/hedera/block/server/consumer/ConsumerBlockItemObserver.java

@@ -71,10 +71,10 @@ public ConsumerBlockItemObserver(
             ((ServerCallStreamObserver<SubscribeStreamResponse>) subscribeStreamResponseObserver)
                     .setOnCancelHandler(
                             () -> {
+                                streamMediator.unsubscribe(this);
                                 LOGGER.log(
                                         System.Logger.Level.DEBUG,
-                                        "Consumer cancelled stream.  Unsubscribing observer.");
-                                streamMediator.unsubscribe(this);
+                                        "Consumer cancelled stream.  Observer unsubscribed.");
                             });
         }