Break infinite refresh loop in battery estimates

There was an infinite loop that could occur in BatterySaverUtils
what was caused by battery saver utils updating the battery estimate
which then told the page to check for an estimate and then it would
repeat from there. This cleans up the logic in that loop slightly
to prevent it from refreshing more than is necessary.

Test: atest BatteryUtilsTest
Bug: 132751712
Change-Id: I918484747ecd9735315570ad608489e0f61d7578