[FileIndexScheduler] Emit change to LowPowerIdle state
Summary:
The state update is emitted from scheduleIndexing. Trigger it also
on changes to battery powered.
The change is mostly cosmetic, as the power state is evaluated correctly
before starting the content indexer.
Test Plan:
- balooctl monitor
- plug/unplug power
State changes between Idle/LowPowerIdle
Reviewers: Baloo, ngraham
Reviewed By: Baloo, ngraham
Subscribers: kde-frameworks-devel
Tags: Frameworks, Baloo
Differential Revision: https://phabricator.kde.org/D28229