Update mMinLearnedBatteryCapacity when necessary.

Currently mMinLearnedBatteryCapacity is only updated once (when it's
-1). We check the minimum of mMinLearnedBatteryCapacity and the new
chargeFullUah reading but never update mMinLearnedBatteryCapacity to the
new value.

Bug: 111132682
Test: manual
Change-Id: I1680e7a4bdf9176feb2a2dcc9f2c10c829202bda
1 file changed