Reapply "JBR-5497: change the default value for the system property "awt.mac.flushBuffers.invokeLater" to 'enabled' to avoid any potential freeze (safe) until a better solution"

This reverts commit 50be626.

Author: vprovodin

src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java

@@ -1192,8 +1192,8 @@ private static int getInvokeLaterMode() {
                 new GetPropertyAction(invokeLaterKey));
         final int result;
         if (invokeLaterArg == null) {
-            // default = 'auto':
-            result = INVOKE_LATER_AUTO;
+            // default = 'enabled' to avoid any potential freeze (safe) until better solution:
+            result = INVOKE_LATER_ENABLED;
         } else {
             switch (invokeLaterArg.toLowerCase()) {
                 default: