Work profile visual polish

- Calculate work profile switch height and apply it as a padding to recyclerview instead of reading height from view.
- Add solid background to work_apps paused overlay for improved crossfade animation on pause/unpause
- Don't show work paused overlay text in landscape mode

Bug 151672365
Bug 153763804
Bug 151595687

Test: Manual
Change-Id: I6c14a8a1624455181d4998555bcc3ae2bb422efe