Bug 11784 - fix displaying patron images in self checkout

Bug 11784 - fix displaying patron images in self checkout

I suppose this bug was introduced with Bug 10636 (patronimage should
have borrowernumber as PK, not cardnumber)

To test:
- Have a Patron with image. Configure everything to show image in SCO.
- Go to SCO and log in patron
- Image does not show up (broken link)
- Apply patch
- Test with prog, ccsr and bootstrap themes
- Image should display

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 9d5fadb9831f03ab80489f9f18467a1796fc9447)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>