Widgets: Avoid to move focus to the Image Widget "Insert from URL" field.

Fixes a bug after [45499], where the backbone view element isn't the input field any longer. Also, managing focus programmatically is often an assumption on a specific user flow and should generally be avoided, see #43169.

Props dufresnesteven, afercia.
Merges [46745] to the 5.3 branch.
See #43169.
Fixes #48588.

git-svn-id: https://develop.svn.wordpress.org/branches/5.3@46781 602fd350-edb4-49c9-b593-d223f7449a82

src/js/_enqueues/wp/widgets/media.js

@@ -417,10 +417,6 @@ wp.mediaWidgets = ( function( $ ) {
 			}).render();
 
 			this.content.set( view );
-
-			if ( ! wp.media.isTouchDevice ) {
-				view.url.focus();
-			}
 		}
 	});