tests: Adjust start() import

Author: Turbo87

tests/test-helper.js

@@ -1,10 +1,8 @@
 import Application from '../app';
 import config from '../config/environment';
 import { setApplication } from '@ember/test-helpers';
-import { start } from 'ember-qunit';
-import loadEmberExam from 'ember-exam/test-support/load';
+import start from 'ember-exam/test-support/start';
 
 setApplication(Application.create(config.APP));
 
-loadEmberExam();
 start();