fix character server/interserver communication

src/ship/ship.rs

@@ -923,7 +923,7 @@ impl<EG: EntityGateway + Clone> InterserverActor for ShipServerState<EG> {
         Vec::new()
     }
 
-    fn set_sender(&mut self, _server_id: ServerId, sender: channel::Sender<Self::SendMessage>) {
+    async fn set_sender(&mut self, _server_id: ServerId, sender: channel::Sender<Self::SendMessage>) {
         self.shipgate_sender = Some(sender);
     }
 }