FIX: Default sort grantable badges by name

Currently has no default sort and was stated as a bug here:
  https://meta.discourse.org/t/badges-not-sorted-in-grant-badge-dropdown/23739
  (Post was recently deleted or made private?)

app/assets/javascripts/admin/controllers/admin-user-badges.js.es6

@@ -32,7 +32,7 @@ export default Ember.ArrayController.extend({
       }
     });
 
-    return badges;
+    return _.sortBy(badges, "name");
   }.property('badges.@each', 'model.@each'),
 
   /**