LPS-41641 - On a mobile device, cannot scroll through Add document types in Site Admin > Documents and Media without collapsing the menu

Hey @ipeychev,

Attached is an update for http://issues.liferay.com/browse/LPS-41641.

NOTE: I merged in the changes that were made for the keyboard accessibility and want you to review this before we send it to @natecavanaugh.

Please let me know if you have any questions.  Thanks!