fix(summaries): remove unnecessary comma

Author: georgianastasov

src/app/hierarchical-grid/hierarchical-grid-disable-summaries/hierarchical-grid-disable-summaries.component.ts

@@ -59,7 +59,7 @@ class GrammySummary {
         IgxCellTemplateDirective,
         IgxRowIslandComponent,
         IgxButtonDirective
-    ],
+    ]
 })
 export class HierarchicalGridDisableSummariesComponent implements OnInit {
     @ViewChild("hierarchicalGrid", { static: true })