Unify and simplify LED/Lamp node definition

SmallJoker

2022-10-20 4775d98fb7e12f7210cf778351767828e551011d

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local S = technic.getter
 
if minetest.registered_nodes["default:furnace"].description == "Furnace" then
    minetest.override_item("default:furnace", { description = S("Fuel-Fired Furnace") })
end