Bugfix and inprovments for arrow navigation.

frontend/src/app/components/mempool-block/mempool-block.component.ts

@@ -3,7 +3,6 @@ import { StateService } from 'src/app/services/state.service';
 import { ActivatedRoute, ParamMap } from '@angular/router';
 import { switchMap, map } from 'rxjs/operators';
 import { MempoolBlock } from 'src/app/interfaces/websocket.interface';
-import { WebsocketService } from 'src/app/services/websocket.service';
 
 @Component({
   selector: 'app-mempool-block',
@@ -17,12 +16,9 @@ export class MempoolBlockComponent implements OnInit, OnDestroy {
   constructor(
     private route: ActivatedRoute,
     private stateService: StateService,
-    private websocketService: WebsocketService,
   ) { }
 
   ngOnInit(): void {
-    this.websocketService.want(['blocks', 'stats', 'mempool-blocks']);
-
     this.route.paramMap.pipe(
       switchMap((params: ParamMap) => {
         this.mempoolBlockIndex = parseInt(params.get('id'), 10) || 0;