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

thetaepsilon-gamedev

2020-01-28 fbc4cc851125bc0a1d48043f78210f4836491beb

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default
technic_worldgen
basic_materials
concrete
unifieddyes?
intllib?
moreblocks?
steel?
streetsmod?