Bug 24016: manager_id in Koha::Patron::Message->store should not depend on userenv...

Bug 24016: manager_id in Koha::Patron::Message->store should not depend on userenv alone

Koha::Patron::Message->store has this

    my $userenv = C4::Context->userenv;
    $self->manager_id( $userenv ? $userenv->{number} : undef);

This breaks in REST API when userenv is not set.

Let API user pass manager_id without relying on C4::Context->userenv.

To test:
1. prove t/db_dependent/Koha/Patron/Messages.t
2. Observe success

Sponsored-by: Koha-Suomi Oy
Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@helsinki.fi>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>