update: remove an old parameter in ceph_key module call

the `containerized` parameter in ceph_key module doesn't exist anymore.
This was making the module failing but was hidden because of the
`ignore_errors: True`.

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

infrastructure-playbooks/rolling_update.yml

@@ -214,7 +214,6 @@
         caps:
           mon: "allow profile {{ item.0 }}"
         cluster: "{{ cluster }}"
-        containerized: "{{ 'docker exec ceph-mon-' + hostvars[item.1]['ansible_hostname'] if containerized_deployment else None }}"
       when:
         - cephx
       delegate_to: "{{ item.1 }}"