Match predbat_car_charging_energy_scale within predai subtract config

[johnwb87]

Hello,

Not an issue really. Just got predai setup and want to let it run for a couple of weeks whilst it gathers data and see how the predictions evolve.

For consistency with predbat I want to apply the same car chaging energy scaling factor to the sensor within subtract argument as is applied using predbat_car_charging_energy_scale.

Is there a correct or preferred way to do this.

Thanks.