fix(combo): remove second combo ripple, #5412

Author: ViktorSlavov

projects/igniteui-angular/src/lib/combo/combo.component.html

@@ -74,7 +74,7 @@
             </ng-container>
         </div>
         <igx-combo-add-item [itemHeight]='itemHeight' *ngIf="isAddButtonVisible()" [tabindex]="dropdown.collapsed ? -1 : customValueFlag ? 1 : -1"
-            class="igx-combo__add-item" igxRipple role="button" aria-label="Add Item" [index]="virtualScrollContainer.igxForOf.length">
+            class="igx-combo__add-item" role="button" aria-label="Add Item" [index]="virtualScrollContainer.igxForOf.length">
             <ng-container *ngTemplateOutlet="addItemTemplate ? addItemTemplate : addItemDefault">
             </ng-container>
         </igx-combo-add-item>