Verify and reset invalid scheduled battery level in the booting stage

The minimum scheduled battery level is changed from 5% to 10% in T, if
users upgrade the device from S to T with invalid level value in
the Settings.Global, we have to force reset it into the new minimum
battery level value.

Bug: 258243197
Test: make RunSettingsRoboTests
Change-Id: I89003120aaebcff78d4bf3f7ae8b54e97adae3c8