Fix the legacy BatterySaverUtilsTest failed test cases

https://screenshot.googleplex.com/7pr5rqFbXzyXBui

Bug: 246960554
Test: make RunSettingsLibRoboTests ROBOTEST_FILTER=com.android.settingslib.fuelgauge.*
Change-Id: I4204bc48d67192aa51045332e548549878fe6f6b
1 file changed