fix(rowIsland): Do no calcualte row island widths, since it does not render element anyway. (#13951)

Author: skrustev

projects/igniteui-angular/src/lib/grids/hierarchical-grid/row-island.component.ts

@@ -380,6 +380,11 @@ export class IgxRowIslandComponent extends IgxHierarchicalGridBaseDirective
      */
     public override calculateGridHeight() { }
 
+    /**
+     * @hidden
+     */
+    public override calculateGridWidth() { }
+
     protected _childColumns = [];
 
     protected updateColumnList() {