Fix matrix federation

Apparently this has been broken since like March...

It seems communication over port 8448 is required for server-to-server
comms, even if the client doesn't use it.

ansible/roles/pve_docker/files/synapse/docker-compose.yml

@@ -21,7 +21,6 @@ services:
       - traefik.enable=true
       - traefik.http.routers.synapse.rule=Host(`matrix.jakehoward.tech`)
       - traefik.http.routers.synapse.tls.certresolver=le
-      - traefik.http.routers.synapse.entrypoints=web-secure,matrix
 
   db:
     image: postgres:12-alpine