Bug 10051: Separate first name and surname with comma in overdues report

Bug 10051: Separate first name and surname with comma in overdues report

The name of the patron who has overdues is displayed as
"surname first name" instead of "surname, first name".

To test:
- Go to circulation > overdues
- Verify that first name and surname are not separated by comma
- Apply patch
- Verify the display is improved with a comma
- Delete the first name from one of the patrons
- Verify display is still ok

Signed-off-by: David Roberts <david.roberts@ptfs-europe.com>
Signed-off-by: Christopher Brannon <cbrannon@debian.localdomain>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>