battery_box.lua: Make "srcstack" local (#525)

fgrosswig

2020-01-06 e90b28895cc28daf1a2e4fb772bd191400cf9e62

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local S = technic.getter
 
function technic.register_extractor(data)
    data.typename = "extracting"
    data.machine_name = "extractor"
    data.machine_desc = S("%s Extractor")
    technic.register_base_machine(data)
end