remove ship from shiplist when it disconnects

src/login/character.rs

@@ -558,6 +558,7 @@ impl<EG: EntityGateway> InterserverActor for CharacterServerState<EG> {
     }
 
     async fn on_disconnect(&mut self, id: ServerId) -> Vec<(ServerId, Self::SendMessage)> {
+        self.ships.remove(&id);
         Vec::new()
     }
 }