Bug 19078 - XSS Flaws in System preferences

Bug 19078 - XSS Flaws in System preferences

1. Hit /cgi-bin/koha/admin/preferences.pl
2. Enter <script>alert('amit')</script> in search system preferences box.
3. Notice the java script is executed.
4. Apply patch.
5. Reload page, and enter <script>alert('amit')</script> in search system preferences box.
6. Notice it is no longer executed.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit b7bb60d76041bf00f6a28fe3a55ecc2c7912a275)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>