Bug 29146: Apply framework defaultvalue only to new records

Bug 29146: Apply framework defaultvalue only to new records

This applies only to the 'regular' cataloguing editor.
Another report could be opened for the advanced one,
if needed.

Test plan:
[1] Add a default value to some field X in framework Y.
[2] Open an existing biblio record in that fw. Clear field X. Save.
[3] Reopen the record. The default should not be in field X.
[4] Add a new record in that fw. You should see default value in X.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>