Make Dimension require matrix-nginx-proxy, if enabled

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/966

group_vars/matrix_servers

@@ -911,6 +911,8 @@ matrix_dimension_systemd_required_services_list: |
     ['docker.service']
     +
     (['matrix-postgres.service'] if matrix_postgres_enabled else [])
+    +
+    (['matrix-nginx-proxy.service'] if matrix_nginx_proxy_enabled else [])
   }}
 
 # Postgres is the default, except if not using `matrix_postgres` (internal postgres)