Change detection refactoring.

frontend/src/app/components/master-page/master-page.component.ts

@@ -7,7 +7,6 @@ import { Observable, merge, of } from 'rxjs';
   selector: 'app-master-page',
   templateUrl: './master-page.component.html',
   styleUrls: ['./master-page.component.scss'],
-  changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class MasterPageComponent implements OnInit {
   env = env;

frontend/src/app/components/start/start.component.ts

@@ -5,7 +5,6 @@ import { WebsocketService } from 'src/app/services/websocket.service';
   selector: 'app-start',
   templateUrl: './start.component.html',
   styleUrls: ['./start.component.scss'],
-  changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class StartComponent implements OnInit {
   constructor(