Bug 7837 - nb-NO z3950servers.sql misses column names

Bug 7837 - nb-NO z3950servers.sql misses column names

Fix installer/data/mysql/nb-NO/2-Valgfritt/z3950servers.sql so it
includes column names.

To test:
- Install the nb-NO language
- Run through the web installer, and make sure to select the optional
  ("Valgfritt") z3950servers.sql file
- Check there are no errors
- Check that the Z39.50 errors are displayed OK in
  Home › Administration › Z39.50 Servers

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Web installer runs without any errors now and I checked that
the Z39.50 servers were imported correctly and can be edited.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>