Bug 11673: columns.def has swapped last and first name of alt contact

Bug 11673: columns.def has swapped last and first name of alt contact

To test:
- Create a new guided circulation report
- On the field list scroll to "Alternate contact: Last name"
=> FAIL:
   "Alternate contact: Last name" relates to borrowers.altcontactfirstname
   "Alternate contact: First name" relates to borrowers.altcontactsurname
- Apply the patch, restart the creation of the report
=> SUCCESS:
   "Alternate contact: First name" relates to borrowers.altcontactfirstname
   "Alternate contact: Surname" relates to borrowers.altcontactsurname
- Sign off :-D

Regards
To+

Sponsored-by: Universidad Nacional de Cordoba
Patch behaves as expected
Signed-off-by: Marc Veron <veron@veron.ch>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>