Behvaiour before this option was added was 'homebranch'
We should preserve this rather than introduce a change
No atomic update added as liobraries may have already set/changed the value,
but safer to default to previous behvaiour
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>