Bug report

The Kendo UI ListView widget is not rendering a vertical scrollbar when the scrollable option is set to "endless" and the content overflows out of its wrapper.

Reproduction of the problem:

1. Set the scrollable option to "endless".

2. Dojo sample for repro:

https://dojo.telerik.com/OKIqAdOv

### Environment

* **Kendo UI version:** 2020.3.915
* **jQuery version:** 1.12.4
* **Browser:** [all]