### Description Update the [Hierarchical Grid ](https://www.infragistics.com/products/ignite-ui-angular/angular/components/hierarchicalgrid/column-pinning#demo-1) and [Tree Grid](https://www.infragistics.com/products/ignite-ui-angular/angular/components/treegrid/column-pinning#demo-1) Custom Column Pinning UI samples to use the same pinning icon as the [Data Grid Custom Column Pinning UI sample](https://www.infragistics.com/products/ignite-ui-angular/angular/components/grid/column-pinning#demo-1) <img width="51" alt="Screenshot 2020-04-02 at 15 43 21" src="https://user-images.githubusercontent.com/1702064/78250796-1539a700-74f9-11ea-9133-6746bc5c3fbe.png">
Description
Update the Hierarchical Grid and Tree Grid Custom Column Pinning UI samples to use the same pinning icon as the Data Grid Custom Column Pinning UI sample
