Deduct iboost power from home load

[MalcolmSpencer]

Is your feature request related to a problem? Please describe. Looking at the code it seems that predbat doesn't subtract the iboost power from today's load in the same way that it does for car charging load. This leads to an over estimate of the house load consumption unless an external helper is created to deduct the iboost load from the inverter home load.

Describe the solution you'd like when iboost is enabled and an energy sensor defined then Predbat should remove the iboost load from the home load in the same way that is does for car charging load

Describe alternatives you've considered create an external helper to remove the iboost power from the inverter how power. if this is the preferred solution then update the documentation to make it clear.

Additional context Add any other context or screenshots about the feature request here.