[gnome-chess] Show pause button only in timed games

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c1b551dc0bf4b633f1ddf1a81511646c1e872251
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Feb 16 16:38:47 2014 -0600

    Show pause button only in timed games

 src/gnome-chess.vala |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index 6236860..b765cc6 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -1087,6 +1087,11 @@ public class Application : Gtk.Application
 
     private void update_pause_resume_button ()
     {
+        if (game != null && game.clock == null)
+            pause_resume_button.hide ();
+        else
+            pause_resume_button.show ();
+
         if (game != null && game.is_paused)
         {
             pause_resume_button.image = new Gtk.Image.from_icon_name ("media-playback-start-symbolic",