Add general top-level class to the secondary admin menu. Fixes hover styling and tabbing JS. fixes #19220.

git-svn-id: https://develop.svn.wordpress.org/trunk@19248 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/class-wp-admin-bar.php

@@ -143,7 +143,7 @@ class WP_Admin_Bar {
 					}
 
 					if ( ! empty( $this->root->children->secondary ) ):
-						?><ul class="top-secondary"><?php
+						?><ul class="ab-top-menu top-secondary"><?php
 
 							foreach ( $this->root->children->secondary as $node ) {
 								$this->recursive_render( $node );