Bug 24564: Use the same tab as the other subfields within a field

Bug 24564: Use the same tab as the other subfields within a field

For each subfield added, we check if other subfields exists in the same
field. If that's the case we use the same tab as the first subfield
found.

Test plan:
1. Find a biblio subfield in
   misc/migration_tools/ifla/data/biblio/default.yml that doesn't exist
   in your default biblio MARC framework (or delete one). The field
   should exist and have other subfields with a tab set.
2. Change the tab of all subfields within that field it's different from
   what's in the .yml file
3. Run misc/migration_tools/ifla/update.pl
4. Verify that the subfield has been added and have the same tab as
   others subfields
5. Do the same for authorities (files are in
   misc/migration_tools/ifla/data/auth/)

Signed-off-by: Koha team <koha@univ-lyon.fr>
Signed-off-by: sonia <sonia.bouis@univ-lyon3.fr>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>