ipaserver: don't ignore zonemgr option on install
Fix zonemgr option in ipaserver install being
ignored because of an incorrect condition.
Fixes: https://pagure.io/freeipa/issue/8718
Signed-off-by: Antonio Torres <antorres@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>