[gnome-chess] Fix keyboard shortcuts dialog

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 81c85f6871fc26638681c61062cbea3064a10ff5
Author: Michael Catanzaro <mcatanzaro redhat com>
Date:   Mon Oct 3 13:31:25 2022 -0500

    Fix keyboard shortcuts dialog
    
    According to the GtkApplication documentation, we are supposed to use a
    well-known action name win.show-help-overlay, not app.show-help-overlay.
    Oops. This has been broken since
    c292a01440bb56e6830db96ad686e2e1418ff4f4.
    
    Fixes #69

 data/chess-window.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/chess-window.ui b/data/chess-window.ui
index 72b9522..2818109 100644
--- a/data/chess-window.ui
+++ b/data/chess-window.ui
@@ -35,7 +35,7 @@
     <section>
       <item>
         <attribute name="label" translatable="yes">_Keyboard Shortcuts</attribute>
-        <attribute name="action">app.show-help-overlay</attribute>
+        <attribute name="action">win.show-help-overlay</attribute>
       </item>
       <item>
         <attribute name="label" translatable="yes">_Help</attribute>