Bug 19125: Fix Stored XSS in members.pl

Bug 19125: Fix Stored XSS in members.pl

In preparation to test this patch:
- Add a patron list named <script>alert("patron list")</script>
- Add a library named <script>alert("library")</script>
- Add a patron category named <script>alert("patron category")</script>

To test:
- Access patron search page and do a search
- Verify that the alerts added above are executed
- Apply patch
- Verify that no alerts are displayed

Signed-off-by: Amit Gupta <amit.gupta@informaticsglobal.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>