Don't flash colors when hinting

We're not flashing the colors anymore while hinting.
This also fixes a bug where the background wasn't
transforming properly when the last view was colorized.

Fixes: 37924486
Fixes: 36413876
Test: hint on lockscreen while the last notification is colorized
Change-Id: Ic9c4bf3c65e5d688ba43d71fb2843ebb7855c4f1