[dconf-editor] Replace deprecated method.

[Arnaud B. <arnaudb src gnome org>]

commit 9dcb9569c6a0ae6232f09b62f4842d11a9374c5a
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Fri Feb 14 05:59:00 2020 +0100

    Replace deprecated method.

 editor/base-window.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/editor/base-window.vala b/editor/base-window.vala
index 4dc64c0..25ec30a 100644
--- a/editor/base-window.vala
+++ b/editor/base-window.vala
@@ -323,7 +323,7 @@ private class BaseWindow : AdaptativeWindow, AdaptativeWidget
         bool success;
         try
         {
-            show_uri (_this.get_screen (), help_string_or_empty, get_current_event_time ());
+            show_uri_on_window (_this, help_string_or_empty, get_current_event_time ());
             success = true;
         }
         catch (Error e)