Fix rogue missing `_client_synapse` in internal admin api

roles/custom/matrix-synapse-reverse-proxy-companion/templates/labels.j2

@@ -163,7 +163,7 @@ traefik.http.routers.matrix-synapse-reverse-proxy-companion-public-client-synaps
 #                                                          #
 ############################################################
 
-traefik.http.routers.matrix-synapse-reverse-proxy-companion-internal-client-synapse-admin-api.rule={{ matrix_synapse_reverse_proxy_companion_container_labels_internal_admin_api_traefik_rule }}
+traefik.http.routers.matrix-synapse-reverse-proxy-companion-internal-client-synapse-admin-api.rule={{ matrix_synapse_reverse_proxy_companion_container_labels_internal_client_synapse_admin_api_traefik_rule }}
 
 {% if matrix_synapse_reverse_proxy_companion_container_labels_internal_client_synapse_admin_api_traefik_priority | int > 0 %}
 traefik.http.routers.matrix-synapse-reverse-proxy-companion-public-client-synapse-admin-api.priority={{ matrix_synapse_reverse_proxy_companion_container_labels_internal_client_synapse_admin_api_traefik_priority }}