gcodemodule/rs274_calc_extents: remove erroneous parameter
gcodemodule/rs274_calc_extents: remove erroneous parameter

This patch by Andy Pugh fixes the spurious "Program exceeds extents"
errors as reported in
http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/catid,38/id,11750/lang,english/

The symptom was mishandling of Z offset as it got "pushed off the parameter
list" by the spurious "unused2 parameter.

Signed-off-by: Michael Haberler <46f1a0bd5592a2f9244ca321b129902a06b53e03@mah.priv.at>

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