Android recents: Fix layout and more, (1/2):

- Clear all button position: Add disabled
- Fix recents screen layout:
  - RecentsHorizontalScrollView starts below statusbar
    (as the ram bar is shown below statusbar, it doesn`t looks nice,
     if the ScrollView is shown under the statusbar)
  - Fix background while using Immersive mode or translucent system bars
  - On landscape move the clear all button 42dp to the left, if position is "... right",
    maximal width of the navigation bar, if shown on the right side,
    to fix the overlay by the navigation bar.
  - On landscape decrease the ram bar width 42dp on each side,
    (to fix the overlay by the navigation bar, if shown on the right side)
  -  Fix clear all button position sometimes doesn`t follow the user setting
  - Some code cleanup