[pz41-beta1] unplugging solar generator is not removing power supply/grid

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Hi,
in PZ41 (and possibly in pz40) when solar generator is disconnected / unplugged, electricity grid is not updated so all devices still have power (until game reload).

This looks to be missing definition of 'NewGenerator:setSurroundingElectricity();' in https://github.com/DemolitionDerby/Hydrocraft/blob/c39a8dad2f0f2b02a5558b529e46467d776615d2/media/lua/client/Solar/solar.lua#L14
(after SetActivated(false)) as adding it did solve this.

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#72 for this and other