8252713: jtreg time out of CtrlASCII.java seems to hang the Xserver.

Backport-of: 6d6046b3799217c281d077f12bce1ec590149849

Author: amosshi

test/jdk/ProblemList.txt

@@ -170,7 +170,6 @@ java/awt/event/KeyEvent/ExtendedKeyCode/ExtendedKeyCodeTest.java 8169476 windows
 java/awt/event/KeyEvent/KeyChar/KeyCharTest.java 8169474,8224055 macosx-all,windows-all
 java/awt/event/KeyEvent/ExtendedModifiersTest/ExtendedModifiersTest.java 8129778 generic-all
 java/awt/event/KeyEvent/KeyMaskTest/KeyMaskTest.java 8129778 generic-all
-java/awt/event/KeyEvent/KeyTyped/CtrlASCII.java 8252713 linux-all
 java/awt/event/MouseEvent/MouseButtonsAndKeyMasksTest/MouseButtonsAndKeyMasksTest.java 8129778 generic-all
 
 java/awt/dnd/URIListToFileListBetweenJVMsTest/URIListToFileListBetweenJVMsTest.java 8194947 generic-all