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

thetaepsilon-gamedev

2020-01-28 fbc4cc851125bc0a1d48043f78210f4836491beb

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name = technic_chests
depends = default, basic_materials
optional_depends = moreblocks, moreores, pipeworks, intllib, tubelib