Fix time until component round for week interval. (#679)

* Fix time until component round for week interval.

* Add forceFloorOnTimeIntervals parameter.

frontend/src/app/components/mempool-blocks/mempool-blocks.component.html

@@ -21,7 +21,7 @@
               <app-time-until [time]="(1 * i) + now + 61000" [fastRender]="false" [fixedRender]="true"></app-time-until>
             </ng-template>
             <ng-template #timeDiffMainnet>
-              <app-time-until [time]="(timeAvg * i) + now + timeAvg" [fastRender]="false" [fixedRender]="true"></app-time-until>
+              <app-time-until [time]="(timeAvg * i) + now + timeAvg" [fastRender]="false" [fixedRender]="true" [forceFloorOnTimeIntervals]="['hour']"></app-time-until>
             </ng-template>
           </div>
           <ng-template #mergedBlock>