chore(*): extend the test debounce time

Author: ddincheva

projects/igniteui-angular/src/lib/grids/grid/grid-keyBoardNav-headers.spec.ts

@@ -440,7 +440,7 @@ describe('IgxGrid - Headers Keyboard navigation #grid', () => {
 
             const afDialog = fix.nativeElement.querySelector('.igx-advanced-filter');
             UIInteractions.triggerKeyDownEvtUponElem('Escape', afDialog);
-            tick(DEBOUNCETIME);
+            tick(100);
             fix.detectChanges();
 
             // Verify AF dialog is closed.