wslua: Drop unused "push_code" macro parameter

wslua: Drop unused "push_code" macro parameter

Reduce noise, no caller has used this parameter since its introduction.
Msotly automated regex search and replace.

Change-Id: I4b1180bfee8544b38d19c9c440ff5b9b0dc080b2
Reviewed-on: https://code.wireshark.org/review/14790
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>