Fix the cancel event function to prevent erroneous close

Changed the conditions for the cancel event function so
that the ULS popup does not close when a descendant element
of the trigger is clicked.

Bug: T122722
Change-Id: I4575804c991b5b597b9eed60f6f0bd6112753e0c

lib/jquery.uls/src/jquery.uls.core.js

@@ -319,7 +319,7 @@
 		 * On cancel handler for the uls menu
 		 */
 		cancel: function ( e ) {
-			if ( e && this.$element.is( e.target ) ) {
+			if ( e && ( this.$element.is( e.target ) || $.contains( this.$element[0], e.target ) ) ) {
 				return;
 			}