Roundtrip efficiency not shown properly in technical & financial properties

[mabijkerk]

When I open a blank scenario for the Netherlands and go to technical & financial properties for electric cars in the Electricity storage section, I get the following table:

A first minor issue is that the title says "Relative storage volume" instead of something like "Electric cars". The main issue however is that the roundtrip efficiency is stated to be 0%, while the node transport_car_flexiblity_p2p_electricity clearly states an output.electricity of 0.87. This is likely related to the definition of the presentation_group v2g in ETEngine.

@kaskranenburgQ or @kndehaan could either of you look into this at some point?

[github-actions]

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