Add missing clock websocket subscriptions

frontend/src/app/components/clock-face/clock-face.component.ts

@@ -26,7 +26,6 @@ export class ClockFaceComponent implements OnInit, OnChanges, OnDestroy {
 
   constructor(
     public stateService: StateService,
-    private websocketService: WebsocketService,
     private cd: ChangeDetectorRef
   ) {
     this.updateTime();

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

@@ -52,7 +52,7 @@ export class ClockComponent implements OnInit {
 
   ngOnInit(): void {
     this.resizeCanvas();
-    this.websocketService.want(['blocks']);
+    this.websocketService.want(['blocks', 'stats', 'mempool-blocks']);
 
     this.blocksSubscription = this.stateService.blocks$
       .subscribe(([block]) => {