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

fgrosswig

2020-01-06 e90b28895cc28daf1a2e4fb772bd191400cf9e62

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name = technic
depends = default, pipeworks, technic_worldgen, basic_materials
optional_depends = bucket, screwdriver, mesecons, mesecons_mvps, digilines, digiline_remote, intllib, unified_inventory, vector_extras, dye