Clean up network calls in placement request_placed

scripts/placement.gd

@@ -25,11 +25,11 @@ func _init(parent, scene_path):
 	set_name("Placement") # We need to share common name for networking
 	set_network_master(net_id)
 	scene = load(scene_path)
-	rpc("request_placed", get_tree().get_network_unique_id())
+	rpc("request_placed")
 
-master func request_placed(from):
+master func request_placed():
 	for node in placed:
-		rpc_id(from, "slave_place", node.transform)
+		rpc_id(get_tree().get_rpc_sender_id(), "slave_place", node.transform)
 
 func place_input(radius=-1):