Fix bug with SMS STAT command starting coolant pump on Tesla Roadster

The line of code in net_prep_stat that clears the car_doors1bits.ChargePort bit causes the ACC code to think the charge port door has been closed and opened, which starts the coolant pump and also start a charging session. I don't want to waste that energy and put that wear on the coolant pump and the battery pack's main contactors.

I don't know what that code's trying to do, but there must be a better way to accomplish it.