test(grid): remove f from tests #8119

Author: hanastasov

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

@@ -26,7 +26,7 @@ const GRID_COL_GROUP_THEAD_TITLE_CLASS = 'igx-grid__thead-title';
 const GRID_COL_GROUP_THEAD_GROUP_CLASS = 'igx-grid__thead-group';
 
 // tslint:disable:max-line-length
-fdescribe('IgxGrid - multi-column headers #grid', () => {
+describe('IgxGrid - multi-column headers #grid', () => {
     configureTestSuite();
 
     let fixture, grid: IgxGridComponent, componentInstance;