[gnome-chess/arnaudb/gesture-multi-press] Replace deprecated method.

[Arnaud B. <arnaudb src gnome org>]

commit 6b841b7415e9fb2128491278cee403709ffb0662
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Apr 6 19:54:19 2020 +0200

    Replace deprecated method.

 src/gnome-chess.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index 46b08b1..69c3e9c 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -2206,7 +2206,7 @@ Copyright © 2015–2016 Sahil Sareen""";
     {
         try
         {
-            show_uri (window.get_screen (), "help:gnome-chess", get_current_event_time ());
+            show_uri_on_window (window, "help:gnome-chess", get_current_event_time ());
         }
         catch (Error e)
         {