fix(query-builder): test confirm button name change

Author: ivanvpetrov

projects/igniteui-angular/src/lib/query-builder/query-builder-functions.spec.ts

@@ -254,7 +254,7 @@ export class QueryBuilderFunctions {
         const actionButtons = fix.debugElement.queryAll(By.css('.igx-filter-tree__inputs-actions > button'));
         const commitButton = actionButtons.filter((el: DebugElement) => {
             const icon = el.query(By.directive(IgxIconComponent)).componentInstance;
-            return icon.name === 'check';
+            return icon.name === 'confirm';
         });
 
         return commitButton[level].nativeElement;