Fix battery saver slider is not displaying

- Doesn't save Settings values to secondary user, caused
BatterySaverUtils.maybeShowBatterySaverConfirmation return true.
BatterySaverScheduleRadioButtonsController reset some Settings to
default when maybeShowBatterySaverConfirmation is true which lead
to the slider hiding.

Fixes: 133782238
Test: change to secondary user. Open Settings -> Battery ->
      Battery Saver -> Set a schedule. User will not see confirm
      dialog after switch different schedule.

Change-Id: I4b8706fd0c542a199fd1e08a44e7a542fbb2d7e7