Customize: Fix nav menu item search after Backbone update.

Fixes regression introduced in [36546].

See #34350.


git-svn-id: https://develop.svn.wordpress.org/trunk@36675 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/js/customize-nav-menus.js

@@ -187,6 +187,8 @@
 
 			// Close the panel if the URL in the preview changes
 			api.previewer.bind( 'url', this.close );
+
+			self.delegateEvents();
 		},
 
 		// Search input change handler.