[Chipbar] Correctly bind icon color for chipbar.

I0305e6d8a879a9fc98295f2a9de43517a3a9992e changed the chipbar icon tint
to be a @ColorRes instead of @AttrRes, but we forgot that we also need
to change the calling code to use it as a color instead of an attr.
(There should probably be screenshot tests for the chipbar, but that's a
separate task.)

Fixes: 384970442
Flag: EXEMPT bugfix
Test: Trigger watch unlock chipbar -> verify icon is tinted correctly
Test: Trigger media TTT chipbar -> verify app icon isn't tinted
Change-Id: I960849a9351c18e57a39bcb7b2f5e4c0bcc6f338