fix: remove extra parentheses with spec test (#490)

resolves #489

Author: liamdebeasi

packages/schematics/page/files/__name@dasherize@if-flat__/__name@dasherize__.page.spec.ts

@@ -5,11 +5,11 @@ describe('<%= classify(name) %>Page', () => {
   let component: <%= classify(name) %>Page;
   let fixture: ComponentFixture<<%= classify(name) %>Page>;
 
-  beforeEach(async(() => {
+  beforeEach(async () => {
     fixture = TestBed.createComponent(<%= classify(name) %>Page);
     component = fixture.componentInstance;
     fixture.detectChanges();
-  }));
+  });
 
   it('should create', () => {
     expect(component).toBeTruthy();