node: Fix edge case in persistent peer connections

If two peers are persistent for each other and experience
disconnections, it's possible that an outbound connection is turned into
an inbound one. But if we don't set that correctly, we'll eventually run
into a crash where an already connected peer re-connects, since the
disconnection logic checks for the link direction.

radicle-node/src/service.rs

@@ -1340,6 +1340,7 @@ where
                         target: "service",
                         "Connecting peer {remote} already has a session open ({peer})"
                     );
+                    peer.link = link;
                     peer.to_connected(self.clock);
                     self.outbox.write_all(peer, msgs);
                 }