Cleanup duplicate call (#522)

Luke aka SwissalpS

2019-12-25 76a39e71b9f81531e14efd7ec1b0accfefa0fa66

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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