Media: Fix focus loss updating custom fields in media modal.

When the save action runs to dynamically save changes to custom fields in the media modal, the custom fields container is re-rendered, losing focus. Remove the re-rendering of custom fields to prevent loss of focus.

Props lucymtc, teebee, syhc, afrin29, antpb, joedolson.
Fixes #40909.

git-svn-id: https://develop.svn.wordpress.org/trunk@55299 602fd350-edb4-49c9-b593-d223f7449a82

Author: joedolson

src/js/media/views/attachment-compat.js

@@ -24,9 +24,6 @@ AttachmentCompat = View.extend(/** @lends wp.media.view.AttachmentCompat.prototy
 		'change textarea': 'save'
 	},
 
-	initialize: function() {
-		this.listenTo( this.model, 'change:compat', this.render );
-	},
 	/**
 	 * @return {wp.media.view.AttachmentCompat} Returns itself to allow chaining.
 	 */