J_BatteryManagementPeakShavingForecast always accounts for all gridconnections, even non active ones.

[Luc-Sol]

J_BatteryManagementPeakShavingForecast should not add the profiles of non active gridconnections to their forecast.
The initialization also should not fail when there are flex assets in non active GCs.
The hard part might be to 'redo' the initialization at the correct moments.