fix(*): resolving lint errors

Author: ChronosSF

src/app/hierarchical-grid/hierarchical-grid-sample-both-sides-pinning/hierarchical-grid-both-sides-pinning.component.ts

@@ -14,7 +14,7 @@ import {
     IgxIconComponent,
     IgxRowIslandComponent,
     IgxButtonDirective,
-    IgxGridToolbarTitleComponent,
+    IgxGridToolbarTitleComponent
 } from "igniteui-angular";
 import { employeesData } from "../../data/employeesData";
 import { athletesData } from "../../data/athletesData";

src/app/tree-grid/tree-grid-sample-both-pinning/tree-grid-both-sides-pinning.component.ts

@@ -6,7 +6,7 @@ import {
     IPinningConfig,
     IgxGridToolbarComponent,
     IgxGridToolbarActionsComponent,
-    IgxButtonDirective,
+    IgxButtonDirective
 } from 'igniteui-angular';
 import { generateEmployeeDetailedFlatData } from '../data/employees-flat-detailed';