test(pdf-exported): remove duplicate/redundant spy call

Author: damyanpetev

projects/igniteui-angular/grids/core/src/services/pdf/pdf-exporter-grid.spec.ts

@@ -404,7 +404,6 @@ describe('PDF Grid Exporter', () => {
             await wait();
 
             pivotGrid = fix.componentInstance.pivotGrid;
-            spyOn(ExportUtilities as any, 'saveBlobToFile');
         });
 
         it('should export basic pivot grid', (done) => {