DefaultUncaughtExceptionHandler: remove no-longer-necessary logic

It was only needed before Java 7, and SciJava now requires Java 8.

Author: ctrueden

src/main/java/org/scijava/log/DefaultUncaughtExceptionHandler.java

@@ -69,10 +69,6 @@ public static void install(final LogService log) {
 		final UncaughtExceptionHandler handler =
 			new DefaultUncaughtExceptionHandler(log);
 		Thread.setDefaultUncaughtExceptionHandler(handler);
-
-		// Needed for modal dialog handling before Java7:
-		System.setProperty("sun.awt.exception.handler",
-			DefaultUncaughtExceptionHandler.class.getName());
 	}
 
 }