Media: Fix improper use of jQuery `hasClass` method.

The jQuery `hasClass` method accepts a class name without a prefix '.' (period). Remove an errant class name with a '.' in `wp-mediaelement.js` that broke the selector in certain circumstances.

Props kostasx, Presskopp.
Fixes #40354.



git-svn-id: https://develop.svn.wordpress.org/trunk@40659 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/mediaelement/wp-mediaelement.js

@@ -44,7 +44,7 @@
 			$( '.wp-audio-shortcode, .wp-video-shortcode' )
 				.not( '.mejs-container' )
 				.filter(function () {
-					return ! $( this ).parent().hasClass( '.mejs-mediaelement' );
+					return ! $( this ).parent().hasClass( 'mejs-mediaelement' );
 				})
 				.mediaelementplayer( settings );
 		}