Test_org_eclipse_swt_browser_Browser.test_CloseWindowListener_close fails randomly

[fedejeanne]

Yet another test failure in the browser tests.

Happened in #2359

Test timed out.
java.lang.AssertionError: Test timed out.
	at org.junit.Assert.fail(Assert.java:89)
	at org.junit.Assert.assertTrue(Assert.java:42)
	at org.eclipse.swt.tests.junit.Test_org_eclipse_swt_browser_Browser.test_CloseWindowListener_close(Test_org_eclipse_swt_browser_Browser.java:540)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	Suppressed: java.lang.Throwable: Screenshot written to C:\Users\RUNNER~1\AppData\Local\Temp\org.eclipse.swt.tests.junit.Test_org_eclipse_swt_browser_Browser.test_CloseWindowListener_close[browser flags: 0].png
		at org.eclipse.test.Screenshots$ScreenshotOnFailure.failed(Screenshots.java:41)
Running Test_org_eclipse_swt_browser_Browser#test_CloseWindowListener_close[browser flags: 0]
AWT screenshot saved to: C:\Users\RUNNER~1\AppData\Local\Temp\org.eclipse.swt.tests.junit.Test_org_eclipse_swt_browser_Browser.test_CloseWindowListener_close[browser flags: 0].png