Bug 32464: Koha::Item->as_marc_field obsolete option mss

Bug 32464: Koha::Item->as_marc_field obsolete option mss

Since Bug 28445 the method Koha::Item->as_marc_field has the option mss not anymore.

This patch removes this in Koha::Filter::MARC::EmbedItems.

Test with :
prove t/db_dependent/Koha/Filter/EmbedItems.t

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 8dfecfb17627881407e5cf9262545d2c6a77d62f)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>