Bug 17023: Fix XSS in acqui/z3950_search.pl

Bug 17023: Fix XSS in acqui/z3950_search.pl

Test plan:
Enter the following in the different inputs:
<script>alert('XSS')</script>

=> Without this patch you will see the alert
=> With this patch, no more alert

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit eb543a90848b97d35aa15052c8881134926a3ed0)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>