__name@dasherize__.component.spec.ts don't use async in spec case

[trimeyko]

Component spec file scheme is old and not consistent with spec in new app since it's not using async() in spec case, should be used by default.

component:
https://github.com/angular/devkit/blob/master/packages/schematics/angular/component/files/__path__/__name%40dasherize%40if-flat__/__name%40dasherize__.component.spec.ts

spec in new app:
https://github.com/angular/devkit/blob/master/packages/schematics/angular/application/other-files/app.component.spec.ts

[alexeagle]

This issue was moved to angular/angular-cli#12161