chore(*): Fix test timing.

Author: MKirova

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

@@ -248,7 +248,7 @@ describe('IgxGrid - Cell component #grid', () => {
             });
         });
 
-        xit('Should not clear selected cell when scrolling with mouse wheel', (async () => {
+        it('Should not clear selected cell when scrolling with mouse wheel', (async () => {
             const cell = grid.gridAPI.get_cell_by_index(3, 'value');
             UIInteractions.simulateClickAndSelectEvent(cell);
             fix.detectChanges();