Browser tests: reduce timeout for instantiation to reasonable value

The timeout for browser instantiation in the browser tests has been
increased to avoid flaky tests. However, browser instantiation taking
more than 10 seconds (the previous timeout value) is an indicator for
something being wrong with the instantiation. There is no reason why
instantiation may take that long during test execution but the same
issue should never arise in productive use, thus such a case should be
captured by tests and, if necessary, be fixed productively.

In order to do so, this change reduces the test timeout value again to a
more reasonable value.

Related to
#1676

Author: HeikoKlare

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_browser_Browser.java

@@ -103,7 +103,7 @@
 public class Test_org_eclipse_swt_browser_Browser extends Test_org_eclipse_swt_widgets_Composite {
 
 	// TODO Reduce to reasonable value
-	private static Duration MAXIMUM_BROWSER_CREATION_TIME = Duration.ofSeconds(90);
+	private static Duration MAXIMUM_BROWSER_CREATION_TIME = Duration.ofSeconds(15);
 
 	static {
 		try {