chore(*): Fix test timing.

Author: MKirova

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

@@ -260,8 +260,8 @@ describe('IgxGrid - Cell component #grid', () => {
 
             const gridContent = GridFunctions.getGridContent(fix);
             UIInteractions.triggerEventHandlerKeyDown('arrowup', gridContent);
+            await wait(16);
             fix.detectChanges();
-            await wait(30);
 
             expect(grid.getCellByColumn(2, 'value').selected).toBeTruthy();
         }));