Bug 14360: Unescaped variable causes alert

Bug 14360: Unescaped variable causes alert

Adding |html to [% resultsperpage %] to escape the variable and get rid of the alert.

To test:

1) Go to URL such as ...  /cgi-bin/koha/opac-authorities-home.pl?op=do_search&resultsperpage=1%22%3E%3Cscript%3Ealert%28document.cookie%29%3C/script%3E
2) Notice pop-up box with alert
3) Apply patch, refresh page
4) Notice alert is gone

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 9e920f7479df6d36db3e3450d6e6c2524fa9fe56)
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>