Customize: Prevent removal of underline upon hover/focus for nav menu deletion links.

Props monikarao.
Amends [38503].
See #37527.
Fixes #39444.

Built from https://develop.svn.wordpress.org/trunk@39677


git-svn-id: http://core.svn.wordpress.org/trunk@39617 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/customize-nav-menus.css

@@ -815,7 +815,6 @@ li.assigned-to-menu-location .add-new-menu-item {
 .menu-delete:hover,
 .menu-delete:focus {
 	color: #f00;
-	text-decoration: none;
 }
 
 .menu-item-handle {