When deleting media grid attachments, wait until the server responds before removing the model from its collection.

Props 5um17.
Fixes #30457.


git-svn-id: https://develop.svn.wordpress.org/trunk@30638 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/media-views.js

@@ -6405,7 +6405,7 @@
 								changed.push( model.save() );
 								removed.push( model );
 							} else {
-								model.destroy();
+								model.destroy({wait: true});
 							}
 						} );