Media Grid: don't select `body` with jQuery when instantiating `media.view.UploaderWindow`.

Props ericlewis.
See #28965.

Built from https://develop.svn.wordpress.org/trunk@29367


git-svn-id: http://core.svn.wordpress.org/trunk@29145 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-grid.js

@@ -81,8 +81,8 @@
 				this.uploader = new media.view.UploaderWindow({
 					controller: this,
 					uploader: {
-						dropzone:  $('body'),
-						container: $('body')
+						dropzone:  document.body,
+						container: document.body
 					}
 				}).render();
 				this.uploader.ready();