technic_cnc/cnc.lua: Fix access to non-existant stack parameter (#528)

thetaepsilon-gamedev

2020-01-28 fbc4cc851125bc0a1d48043f78210f4836491beb

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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