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.

(cherry picked from commit a7c69637)

Change-Id: I558447f282bb54f13be1622c3f2528a383fbc3b7
Fixes: 62423352
Test: runtest -x packages/SystemUI/tests/src/com/android/systemui/statusbar/ExpandableNotificationRowTest.java