Use Element's configured port in Traefik labels

roles/custom/matrix-client-element/templates/labels.j2

@@ -11,7 +11,7 @@ traefik.enable=true
 traefik.docker.network={{ matrix_client_element_container_labels_traefik_docker_network }}
 {% endif %}
 
-traefik.http.services.matrix-client-element.loadbalancer.server.port=8080
+traefik.http.services.matrix-client-element.loadbalancer.server.port={{ matrix_client_element_container_port }}
 
 {% set middlewares = [] %}