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

fgrosswig

2020-01-06 e90b28895cc28daf1a2e4fb772bd191400cf9e62

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default
pipeworks
technic_worldgen
basic_materials
bucket?
screwdriver?
mesecons?
mesecons_mvps?
digilines?
digiline_remote?
intllib?
unified_inventory?
vector_extras?
dye?