[battery] rearrange attributions to match old battery

The old BatteryMeterView had an explicit ordering or powersave,
defender, and charging in that order. This CL makes the new battery
respect that ordering as well.

Bug: 400371915
Bug: 400455810
Test: BatteryInteractorTest BatteryViewModelTest
Flag: com.android.settingslib.flags.new_status_bar_icons
Change-Id: I362a8333bd88991fdf800ca4ed32c29747a37521