fix(@angular/cli): restore e2e blueprint

This reverts commit ba15605.

The commit introduced non idiomatic Protractor code.

Author: cexbrayat

packages/@angular/cli/blueprints/ng/files/e2e/app.e2e-spec.ts

@@ -7,10 +7,8 @@ describe('<%= htmlComponentName %> App', () => {
     page = new <%= jsComponentName %>Page();
   });
 
-  it('should display welcome message', done => {
+  it('should display welcome message', () => {
     page.navigateTo();
-    page.getParagraphText()
-      .then(msg => expect(msg).toEqual('Welcome to <%= prefix %>!!'))
-      .then(done, done.fail);
+    expect(page.getParagraphText()).toEqual('Welcome to <%= prefix %>!!');
   });
 });