Correct usage of public_key_algorithm_oid in ipalib/x509
public_key_algorithm_oid is property of underlying Certificate object
that is not supposed to be callable. I missed that it contained
() at the end.
Fixes: https://pagure.io/freeipa/issue/9641
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>