fix(esf): show missing columns in select #2879 (#2892)

Author: zhosti

src/app/hierarchical-grid/hierarchical-grid-external-excel-style-filtering/hierarchical-grid-external-excel-style-filtering.component.ts

@@ -21,7 +21,6 @@ export class HGridExternalExcelStyleFilteringComponent implements AfterViewInit{
     }
 
     public ngAfterViewInit() {
-        this.columns = this.hgrid.columns.filter(c => c.filterable);
-
+        this.columns = this.hgrid.columnList.filter(c => c.filterable);
     }
 }