8002114: fix failed for JDK-7160951: [macosx] ActionListener called twice for...

8002114: fix failed for JDK-7160951: [macosx] ActionListener called twice for JMenuItem using ScreenMenuBar
Reviewed-by: serb

src/macosx/native/sun/awt/CMenuItem.m

@@ -76,7 +76,7 @@ JNF_COCOA_ENTER(env);
     NSEvent *currEvent = [[NSApplication sharedApplication] currentEvent];
     if ([currEvent type] == NSKeyDown) {
         NSString *menuKey = [sender keyEquivalent];
-        NSString *eventKey = [currEvent characters];
+        NSString *eventKey = [currEvent charactersIgnoringModifiers];
         if ([menuKey isEqualToString:eventKey]) {
             return;
         }