[quadrapassel] Use the dark theme

[Mario Wenzel <mariowenzel src gnome org>]

commit 045ecffabcc118f320fd52cc3bf3b429131b96ed
Author: Mario Wenzel <maweki gmail com>
Date:   Sat Oct 26 14:22:59 2013 +0200

    Use the dark theme
    
    As suggested by Allan Day, the dark theme has been enabled for
    quadrapassel https://bugzilla.gnome.org/show_bug.cgi?id=710617

 src/quadrapassel.vala |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/quadrapassel.vala b/src/quadrapassel.vala
index f061fd3..52313f2 100644
--- a/src/quadrapassel.vala
+++ b/src/quadrapassel.vala
@@ -78,6 +78,8 @@ public class Quadrapassel : Gtk.Application
     {
         base.startup ();
 
+        Gtk.Settings.get_default ().set ("gtk-application-prefer-dark-theme", true);
+
         add_action_entries (action_entries, this);
         add_accelerator ("<Primary>n", "app.new-game", null);
         add_accelerator ("Pause", "app.pause", null);