Fix quick settings on Keyguard

- Fix that quick settings couldn't be scrolled nor closed on Keyguard
if scrolling was needed.
- Fix jumping in unlock motion when closing both panel and QS
- Fix invalid panel height when closing both QS and panel

Bug: 18481668
Change-Id: Ifd12e29bbc64f72f0dc13b43e36b1a57df7524fa