test(hgrid): adding debounce time to wait

Author: kdinev

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.navigation.spec.ts

@@ -317,7 +317,7 @@ describe('IgxHierarchicalGrid Navigation', () => {
             GridFunctions.focusCell(fixture, fCell);
 
             UIInteractions.triggerEventHandlerKeyDown('arrowdown', baseHGridContent, false, false, false);
-            await wait();
+            await wait(DEBOUNCE_TIME);
             fixture.detectChanges();
 
             const childFirstCell =  childGrid.dataRowList.toArray()[0].cells.toArray()[0];