The minimum value which can be set as trigger for
Battery saver was changed from 10% -> 20% however the
settings UI was not aligned with this change.
ref: b0fe225 Update the battery saver scheduler minimum level
Update the UI to align with the minimum trigger
level.
Bug: 396444535
Test: manual, check minimum seekbar value after reboot.
Test: atest BatterySaverScheduleSeekBarControllerTest
Change-Id: I4baa766ff1cb78ce656ae340ce930094b9e124e0
37bf0fbe57