[gnome-calculator] Fixed deprecation warning

[Robert Roth <robertroth src gnome org>]

commit a67d437fe35f83a0ea6238b7346f04eb0eb3967d
Author: Robert Roth <robert roth off gmail com>
Date:   Tue Nov 3 01:27:16 2020 +0200

    Fixed deprecation warning

 src/gnome-calculator.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gnome-calculator.vala b/src/gnome-calculator.vala
index c72b8dbd..6edf4c8b 100644
--- a/src/gnome-calculator.vala
+++ b/src/gnome-calculator.vala
@@ -291,7 +291,7 @@ public class Calculator : Gtk.Application
     {
         try
         {
-            Gtk.show_uri (get_active_window ().get_screen (), "help:gnome-calculator", 
Gtk.get_current_event_time ());
+            Gtk.show_uri_on_window (get_active_window (), "help:gnome-calculator", 
Gtk.get_current_event_time ());
         }
         catch (Error e)
         {