Bug 16069 - XSS issue in basket.pl page

Bug 16069 - XSS issue in basket.pl page

1. Hit /cgi-bin/koha/acqui/basket.pl?basketno=xx<script>alert('amit')</script>
   xx - is a basketno
2. Notice the java script is executed.
3. Apply patch.
4. Reload page, and hit the page again /cgi-bin/koha/acqui/basket.pl?basketno==xx<script>alert('amit')</script>
   xx - is a basketno.
5. Notice it is no longer executed.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>