Prevent button action from enabling disabled DPMS

Button actions call triggerImpl, which leaves DPMS enabled. It can't be
disabled until return from idle, as that would wake the screen. Solve
this by explicitly setting DPMS timeouts to zero when DPMS is meant to
be disabled - i.e. when unloading the action or when screen power
management is inhibited.

CCBUG: 295164
REVIEW: 106794