Banner module: Switch to using activated/unactivated for state

These are defined as valid values in the enum for state, and have more
or less the same meaning as activated/unactivated.

Bug: T273084
Change-Id: Ia66be5fb6853a6d169c1fe41380d7b42cb5acdbc
(cherry picked from commit 79c1690d24e033b2f3a0e04b7c7c007d4cc110e4)