Fixed an issue where the icons had the wrong color

The color of the icons was taken from the ambient view
and wasn't updated when dark changed.

Change-Id: I472e76ff9d4d92500faae5517f10bdeb2658936d
Fixes: 62423352
Test: runtest -x packages/SystemUI/tests/src/com/android/systemui/statusbar/ExpandableNotificationRowTest.java
(cherry picked from commit a7c69637)