chore(pivot): Remove fdescribe

Author: dkamburov

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

@@ -2,7 +2,7 @@ import { IgxNumberSummaryOperand } from '../summaries/grid-summary';
 import { IPivotConfiguration, IPivotValue } from './pivot-grid.interface';
 import { IgxPivotColumnPipe, IgxPivotRowPipe } from './pivot-grid.pipes';
 
-fdescribe('Pivot pipes', () => {
+describe('Pivot pipes', () => {
     // This pipe is a pure, stateless function so no need for BeforeEach
     const rowPipe = new IgxPivotRowPipe();
     const columnPipe = new IgxPivotColumnPipe();