style: remove redundant async in tests

In component specs only the `compileComponents` is async thus the `async` on `it` are redudnant

Closes #12161

packages/schematics/angular/application/other-files/app.component.spec.ts

@@ -1,7 +1,7 @@
 import { TestBed, async } from '@angular/core/testing';<% if (routing) { %>
 import { RouterTestingModule } from '@angular/router/testing';<% } %>
 import { AppComponent } from './app.component';
-                                                                        
+
 describe('AppComponent', () => {
   beforeEach(async(() => {
     TestBed.configureTestingModule({<% if (routing) { %>
@@ -14,22 +14,22 @@ describe('AppComponent', () => {
     }).compileComponents();
   }));
 
-  it('should create the app', async(() => {
+  it('should create the app', () => {
     const fixture = TestBed.createComponent(AppComponent);
     const app = fixture.debugElement.componentInstance;
     expect(app).toBeTruthy();
-  }));
+  });
 
-  it(`should have as title '<%= name %>'`, async(() => {
+  it(`should have as title '<%= name %>'`, () => {
     const fixture = TestBed.createComponent(AppComponent);
     const app = fixture.debugElement.componentInstance;
     expect(app.title).toEqual('<%= name %>');
-  }));
+  });
 
-  it('should render title in a h1 tag', async(() => {
+  it('should render title in a h1 tag', () => {
     const fixture = TestBed.createComponent(AppComponent);
     fixture.detectChanges();
     const compiled = fixture.debugElement.nativeElement;
     expect(compiled.querySelector('h1').textContent).toContain('Welcome to <%= name %>!');
-  }));
+  });
 });