chore(hgrid): Remove expanded property as it is not part of the record

Author: dkamburov

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid-api.service.ts

@@ -113,8 +113,7 @@ export class IgxHierarchicalGridAPIService extends GridBaseAPIService<IgxGridBas
     public allow_expansion_state_change(rowID, expanded): boolean {
         const rec = this.get_rec_by_id(rowID);
         const grid = (this.grid as any);
-        if (rec.expanded === expanded ||
-            (grid.hasChildrenKey && !rec[grid.hasChildrenKey])) {
+        if (grid.hasChildrenKey && !rec[grid.hasChildrenKey]) {
             return false;
         }
         return !!rec && this.grid.expansionStates.get(rowID) !== expanded;