Widgets: Fix deferred rendering of controls for media widgets until container element fully expands.

Adds omitted call to `renderWhenAnimationDone()` which was missed when this code was copied from the Text widget.

Amends [40656].
See #40750.


git-svn-id: https://develop.svn.wordpress.org/trunk@40660 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/js/widgets/media-widgets.js

@@ -1065,6 +1065,7 @@ wp.mediaWidgets = ( function( $ ) {
 				widgetControl.render();
 			}
 		};
+		renderWhenAnimationDone();
 
 		/*
 		 * Note that the model and control currently won't ever get garbage-collected