Bug 36919: Remove yet another warning from Koha/Object.t

Bug 36919: Remove yet another warning from Koha/Object.t

DBIx::Class::Storage::DBI::insert(): Missing value for primary key column 'currency' on Currency - perhaps you forgot to set its 'is_auto_increment' attribute during add_columns()? Treating 'currency' implicitly as an autoinc, and attempting value retrieval at /kohadevbox/koha/Koha/Object.pm line 172
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>