Remove obsolete DOMContentLoadedEventListener

app/assets/javascripts/pages/projects/feature_flags_user_lists/new/index.js

+/* eslint-disable no-new */
+
 import Vue from 'vue';
 import Vuex from 'vuex';
 import NewUserList from '~/user_lists/components/new_user_list.vue';
@@ -5,18 +7,16 @@ import createStore from '~/user_lists/store/new';
 
 Vue.use(Vuex);
 
-document.addEventListener('DOMContentLoaded', () => {
-  const el = document.getElementById('js-new-user-list');
-  const { userListsDocsPath, featureFlagsPath } = el.dataset;
-  return new Vue({
-    el,
-    store: createStore(el.dataset),
-    provide: {
-      userListsDocsPath,
-      featureFlagsPath,
-    },
-    render(h) {
-      return h(NewUserList);
-    },
-  });
+const el = document.getElementById('js-new-user-list');
+const { userListsDocsPath, featureFlagsPath } = el.dataset;
+new Vue({
+  el,
+  store: createStore(el.dataset),
+  provide: {
+    userListsDocsPath,
+    featureFlagsPath,
+  },
+  render(h) {
+    return h(NewUserList);
+  },
 });