Ensure that the tint is properly applied in docked mode.

- The signal cluster dedupes multiple calls with the same value, but 
  since the first calls come before the rotation relayout, the dark 
  tint is calculated incorrectly and subsequent calls get deduped.
  Ensure that if the layout changes, we also update the tint of all 
  icons again.

Bug: 29390902
Change-Id: I79c3796cba2f9a94d44f9fd59cf1702a64b62cd9