Fix unnecessary request of blocks on dashboard load

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

@@ -24,7 +24,7 @@ export class StartComponent implements OnInit, AfterViewChecked, OnDestroy {
   timeLtrSubscription: Subscription;
   timeLtr: boolean = this.stateService.timeLtr.value;
   chainTipSubscription: Subscription;
-  chainTip: number = 100;
+  chainTip: number = -1;
   tipIsSet: boolean = false;
   lastMark: MarkBlockState;
   markBlockSubscription: Subscription;