calculateBatteryDischarge is probably incomplete

[UltimateSteve99]

In BatteryCapacity.h, the calculateBatteryDischarge function only reads voltage and current from the battery bus, ignoring the 5v and 3.3v buses. It is possible that I misread it and everything goes through the battery bus, the diagrams aren't super clear on that, but I think the other buses need to be taken into account (unless, of course, nothing is hooked up to them). Fixing this requires adding more values to the BatteryMeasurement struct (which I am working on right now).