DEV: reduces memory footprint of tests - step 1 (#7591)

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

@@ -5,10 +5,14 @@ const MAX_FIELDS = 20;
 export default Ember.Controller.extend({
   fieldTypes: null,
   createDisabled: Ember.computed.gte("model.length", MAX_FIELDS),
-
-  fieldSortOrder: ["position"],
   sortedFields: Ember.computed.sort("model", "fieldSortOrder"),
 
+  init() {
+    this._super(...arguments);
+
+    this.fieldSortOrder = ["position"];
+  },
+
   actions: {
     createField() {
       const f = this.store.createRecord("user-field", {