[gnome-2048] Fix build after libgames-support API change

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 2199aeb5a9e3f57d16f602f3863bc993206652ad
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Sep 19 18:38:51 2015 -0500

    Fix build after libgames-support API change

 src/application.vala |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)
---
diff --git a/src/application.vala b/src/application.vala
index 016e006..2cbb12b 100644
--- a/src/application.vala
+++ b/src/application.vala
@@ -320,21 +320,21 @@ public class Application : Gtk.Application
     _congrats_message = builder.get_object ("messagelabel") as Gtk.Label;
   }
 
+  private Games.Scores.Category category_request (string key)
+  {
+    if (key == "grid4")
+      return _grid4_cat;
+    else if (key == "grid5")
+      return _grid5_cat;
+    assert_not_reached ();
+  }
+
   private void _create_scores ()
   {
-    _scores_ctx = new Scores.Context ("gnome-2048", "", _window, Scores.Style.PLAIN_DESCENDING);
+    _scores_ctx = new Scores.Context ("gnome-2048", "", _window, category_request, 
Scores.Style.PLAIN_DESCENDING);
     _grid4_cat = new Scores.Category ("grid4", "Grid 4 x 4");
     _grid5_cat = new Scores.Category ("grid5", "Grid 5 x 5");
 
-    _scores_ctx.category_request.connect ( (s, key) => {
-      if (key == "grid4")
-        return _grid4_cat;
-      else if (key == "grid5")
-        return _grid5_cat;
-      else
-        return null;
-    });
-
     if (!_scores_ctx.has_scores ())
       ((SimpleAction) lookup_action ("scores")).set_enabled (false);
   }