fix(hgrid): update row-island summary row height when changing display density

Author: mmart1n

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

@@ -595,8 +595,10 @@ export class IgxHierarchicalGridComponent extends IgxHierarchicalGridBaseDirecti
 
         if (this.parent) {
             this._displayDensity = this.rootGrid.displayDensity;
+            this.summaryService.summaryHeight = 0;
             this.rootGrid.onDensityChanged.pipe(takeUntil(this.destroy$)).subscribe(() => {
                 this._displayDensity = this.rootGrid.displayDensity;
+                this.summaryService.summaryHeight = 0;
                 this.notifyChanges(true);
                 this.cdr.markForCheck();
             });