Adjust Router base class

see https://github.com/DockYard/ember-router-scroll/tree/v4.0.1#usage--4x

Author: Turbo87

app/router.js

@@ -1,8 +1,8 @@
-import RouterScroll from 'ember-router-scroll';
+import EmberRouter from '@ember/routing/router';
 
 import config from './config/environment';
 
-export default class Router extends RouterScroll {
+export default class Router extends EmberRouter {
   location = config.locationType;
   rootURL = config.rootURL;
 }