[2.0.38] Generator-equipment item tooltip has wrong power consumption

[StephenB]

* Add a generator-equipment with power of say 200kW, with a burner power source with effectivity 0.5. Add an item with place_as_equipment_result of that generator-equipment. (You could download this mod and then unzip and change the line in data.lua that sets effectivity = 1 to instead make it 0.5.)
* Item tooltip says power consumption is 200kW. Factoriopedia also says 200kW.
* If you put the equipment in your equipment grid, its tooltip now says power consumption is 400kW.
* From testing, the equipment tooltip is correct, it burns 400kW, and gives 200kW to equipment.