Bug 17036: Fix XSS in circulation.pl

Bug 17036: Fix XSS in circulation.pl

Test plan:
Enter the following in the "Check out" tab:
"><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: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 96a9c2715ee2e4388e105e86e221bc280e1d757f)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
(cherry picked from commit 3bf66eb1a1af1f917ffbf3865762cac64bfdbaef)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>