Do not serialize `MultiplayerSpawner.spawn_function`

modules/multiplayer/multiplayer_spawner.cpp

@@ -175,7 +175,7 @@ void MultiplayerSpawner::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("get_spawn_function"), &MultiplayerSpawner::get_spawn_function);
 	ClassDB::bind_method(D_METHOD("set_spawn_function", "spawn_function"), &MultiplayerSpawner::set_spawn_function);
-	ADD_PROPERTY(PropertyInfo(Variant::CALLABLE, "spawn_function", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR), "set_spawn_function", "get_spawn_function");
+	ADD_PROPERTY(PropertyInfo(Variant::CALLABLE, "spawn_function", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NONE), "set_spawn_function", "get_spawn_function");
 
 	ADD_SIGNAL(MethodInfo("despawned", PropertyInfo(Variant::OBJECT, "node", PROPERTY_HINT_RESOURCE_TYPE, "Node")));
 	ADD_SIGNAL(MethodInfo("spawned", PropertyInfo(Variant::OBJECT, "node", PROPERTY_HINT_RESOURCE_TYPE, "Node")));