QS Talkback bug fixes

Fixes a couple of Talkback bugs in QSCustomizer:
* List scrolling
* Focusing on correct element when "move" is selected.
* No reading "double tap and hold for long press".

Also, Dark Mode tile made a switch

Fixes: 145259342
Fixes: 145257223
Test: manual using TB
Change-Id: I782dad4e1a411972c40e37abc31eabb3fd1f8ea2