Bug 32457: Fix CGI vulnerability in addorder.pl

Bug 32457: Fix CGI vulnerability in addorder.pl

Test plan:
Go to acqui/addorder.pl.
Create two items.
Check if results still match your expectations.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit b389f9a361cf16c11f3678b8e42aa6eb1e91a930)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 427d0b32e9aefa812ac97497b79cbe511fbbca05)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>