Vehicle-mounted minireactor cannot charge connected vehicle / electric network

[olanti-p]

Repro steps:

1. Build battery and cable connector, or obtain a vehicle with empty battery
2. Obtain a vehicle with charged minireactor
3. Turn on reactor, connect the vehicle via jumper cable to vehicle/network from step 1

Expected

Minireactor recharges vehicle's battery, then all connected batteries.

Got

Minireactor recharges vehicle's battery, then goes into passive mode.

Game version: f3c8e168c39c4df50b0271778ff8d706c1099437

[olanti-p]

May be possible to salvage https://github.com/CleverRaven/Cataclysm-DDA/pull/58362 for a fix