Fix deadlock when changing server (#200)

* Fix deadlock when changing server

* remove unnecessary clones

---------

Co-authored-by: mat <git@matdoes.dev>

Author: Kumpelinus

azalea-client/src/packet_handling/game.rs

@@ -286,14 +286,11 @@ pub fn process_packet_events(ecs: &mut World) {
                         Some(player_entity),
                     );
                     {
+                        let map = instance_holder.instance.read().registries.map.clone();
                         let new_registries = &mut weak_instance.write().registries;
                         // add the registries from this instance to the weak instance
-                        for (registry_name, registry) in
-                            &instance_holder.instance.read().registries.map
-                        {
-                            new_registries
-                                .map
-                                .insert(registry_name.clone(), registry.clone());
+                        for (registry_name, registry) in map {
+                            new_registries.map.insert(registry_name, registry);
                         }
                     }
                     instance_holder.instance = weak_instance;