Drop ovn-ctl download from OVN relay image

The packaged ovn-ctl already supports relays: OVN 26.03 on Rocky and
Ubuntu, and 25.03 on Debian.

Change-Id: I1597d9fbc6905207e86893d998ca85eb90de21dc
Signed-off-by: Bartosz Bezak <bartosz@stackhpc.com>

kolla/docker/ovn/ovn-sb-db-relay/Dockerfile.j2

@@ -7,12 +7,6 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}"
 
 {% import "macros.j2" as macros with context %}
 
-{% block ovn_sb_db_relay_ovn_ctl %}
-{# TODO(mnasiadka): Switch to 25.03 branch when available, ideally rpm/deb packages will be
-                    available. #}
-RUN curl -o /usr/share/ovn/scripts/ovn-ctl https://raw.githubusercontent.com/ovn-org/ovn/refs/heads/main/utilities/ovn-ctl
-{% endblock %}
-
 COPY extend_start.sh /usr/local/bin/kolla_ovn_extend_start
 RUN chmod 644 /usr/local/bin/kolla_ovn_extend_start