Fix failing tests.

app/assets/javascripts/discourse/widgets/post-menu.js.es6

@@ -1,7 +1,6 @@
 import { createWidget } from 'discourse/widgets/widget';
 import { avatarAtts } from 'discourse/widgets/actions-summary';
 import { h } from 'virtual-dom';
-import User from 'discourse/models/user';
 
 const LIKE_ACTION = 2;
 
@@ -308,7 +307,7 @@ export default createWidget('post-menu', {
   },
 
   like() {
-    if (!User.current()) {
+    if (!this.currentUser) {
       return this.sendWidgetAction('showLogin');
     }
     const attrs = this.attrs;