Update to new Django admin styles for v3.x

media/admin/js/jquery.init.js

@@ -1,7 +1,8 @@
+/*global jQuery:false*/
+'use strict';
 /* Puts the included jQuery into our own namespace using noConflict and passing
  * it 'true'. This ensures that the included jQuery doesn't pollute the global
  * namespace (i.e. this preserves pre-existing values for both window.$ and
  * window.jQuery).
  */
-var django = django || {};
-django.jQuery = jQuery.noConflict(true);
+window.django = {jQuery: jQuery.noConflict(true)};