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

thetaepsilon-gamedev

2020-01-28 fbc4cc851125bc0a1d48043f78210f4836491beb

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RealBadAngel <maciej.kasatkin@o2.pl> <mk@realbadangel.pl>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com> <vanessa@rainbird.(none)>
kaeza <kaeza@users.sf.net> Diego Martínez <kaeza@users.sf.net>