Fix parent menu not closed on item execution

This is a regression introduced in 3.5 with commit
e3231d62527a4cb7a6ae73058fe59b66c722a01a. In case od cascade menus, we
should check the item's parent menu if pressed and not the current menu.

Bug 537964: Context menu with a submenu, keeps parent menu open on click
https://bugs.eclipse.org/bugs/show_bug.cgi?id=537964

Change-Id: I19ffe5044d2115d52716cce06f6e82ca9cee7f84
diff --git a/bundles/org.eclipse.rap.rwt/js/rwt/widgets/util/MenuManager.js b/bundles/org.eclipse.rap.rwt/js/rwt/widgets/util/MenuManager.js
index 8cfddd9..dec0cad 100644
--- a/bundles/org.eclipse.rap.rwt/js/rwt/widgets/util/MenuManager.js
+++ b/bundles/org.eclipse.rap.rwt/js/rwt/widgets/util/MenuManager.js
@@ -69,7 +69,7 @@
             if (    isMouseUp
                  && menu.isSubElement( target, true )
                  && target.isEnabled()
-                 && menu.isPressed() )
+                 && target.getParentMenu().isPressed() )
             {
               hide = true;
             }