Fix ajax on add menu item boxes. props koopersmith, see #13204

git-svn-id: https://develop.svn.wordpress.org/trunk@14332 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/js/nav-menu.dev.js

@@ -251,7 +251,7 @@ var WPNavMenuHandler = function () {
 					var activePanel,
 					panelIdMatch = /#(.*)$/.exec(e.target.href),
 					tabPanels,
-					wrapper = getParentWrapper(e.target, 'inside'),
+					wrapper = $(e.target).parents('.inside').first()[0],
 					inputs = wrapper ? wrapper.getElementsByTagName('input') : [],
 					i = inputs.length;