<Swing Dev> FR: 8233566: [TESTBUG] KeyboardFocusManager tests failing on MacoS

[Pankaj Bansal]

Hi All,

Please review the following test only fix for jdk15.

Bug : https://bugs.openjdk.java.net/browse/JDK-8233566

webrev: http://cr.openjdk.java.net/~pbansal/8233566/webrev/ 
<http://cr.openjdk.java.net/%7Epbansal/8233566/webrev/>

These tests were added to the ProblemList as they were failing in 
nightly automated testing. Most probably because of bad configuration in 
particular system. Ran these tests again several times and they are 
passing in mach5. Links are in JBS. So removing these from the problem 
list.

java/awt/KeyboardFocusmanager/TypeAhead/SubMenuShowTest/SubMenuShowTest.java: 
This test passes without any change.

java/awt/KeyboardFocusmanager/TypeAhead/EnqueueWithDialogTest/EnqueueWithDialogTest.java: 
I have made changes in the test to properly dispose the frame in final 
block.

Regards
Pankaj