facts: fix 'set_fact rgw_instances with rgw multisite'
facts: fix 'set_fact rgw_instances with rgw multisite'

the current condition doesn't work, as soon as the first iteration is
done the condition makes next iterations skip since `rgw_instances` got
set with the first iteration.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1859872

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible