Bug 17146: Fix CSRF in picture-upload.pl

Bug 17146: Fix CSRF in picture-upload.pl

If an attacker can get an authenticated Koha user to visit their page
with the
url below, they can change or delete patrons' images
/tools/picture-upload.pl?op=Delete&borrowernumber=42

Test plan:
1/ Hit /tools/picture-upload.pl?op=Delete&borrowernumber=42
And confirm that you get a "Wrong CSRF token" error
2/ Go on the patron detail page with a patron's image
3/ Click on the Delete link (note the csrf_token param)
4/ The image will be deleted and you are redirected to the patron detail
page.

Regression tests:
Upload an image from the patron detail page and from the "upload patron
images" tool.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>