MINOR: peers: stop relying on srv->addr to find peer port

Now that peers entirely rely on peer->srv for connection settings, and
that it was confirmed that it works properly thanks to previous commit,
let's finish what we started in f6ae258 ("MINOR: peers: rely on srv->addr
and remove peer->addr") and stop using srv->addr to find out peers port
and instead rely on srv->svc_port as it's already done for other proxy
types.

src/peers.c

@@ -4040,7 +4040,7 @@ static int peers_dump_peer(struct buffer *msg, struct appctx *appctx, struct pee
 	              peer, peer->id,
 	              peer->local ? "local" : "remote",
 	              peer->appctx ? "active" : "inactive",
-	              pn, get_host_port(&peer->srv->addr),
+	              pn, peer->srv->svc_port,
 	              statuscode_str(peer->statuscode));
 
 	chunk_appendf(msg, " last_hdshk=%s\n",