Make sure the close button in the Customizer still works after a refresh. props lessbloat. fixes #22682.

git-svn-id: https://develop.svn.wordpress.org/trunk@25027 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/js/customize-controls.js

@@ -862,7 +862,7 @@
 			if ( 9 === event.which ) // tab
 				return;
 			if ( 13 === event.which ) // enter
-				parent.send( 'close' );
+				this.click();
 			event.preventDefault();
 		});