Merge pull request #14540 from IgniteUI/dTsvetkov/fix-bug-14281-18.0.x

build(*): Change pivot row takeUntil import

Author: ChronosSF

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-row-dimension-header.component.ts

@@ -8,7 +8,7 @@ import { SortingIndexPipe } from '../headers/pipes';
 import { NgTemplateOutlet, NgIf, NgClass } from '@angular/common';
 import { IgxIconComponent } from '../../icon/icon.component';
 import { ISortingExpression, SortingDirection } from '../../data-operations/sorting-strategy';
-import { takeUntil } from 'rxjs';
+import { takeUntil } from 'rxjs/operators';
 
 /**
  * @hidden