[quadrapassel] Fix bug where falling block shadow would get missing

[Mario Wenzel <mariowenzel src gnome org>]

commit b8d1ae902b89e7e3d055d3ab8462f6412e8812be
Author: Mario Wenzel <maweki gmail com>
Date:   Sun Jun 16 15:05:32 2013 +0200

    Fix bug where falling block shadow would get missing
    
    The shape shadow does not get reset so if a new game starts
    the group it is being rendered to, no longer exists. The shape
    gets reset with a new game.
    see https://bugzilla.gnome.org/show_bug.cgi?id=702387

 src/game-view.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/game-view.vala b/src/game-view.vala
index 2efb093..d2df251 100644
--- a/src/game-view.vala
+++ b/src/game-view.vala
@@ -21,6 +21,7 @@ public class GameView : GtkClutter.Embed
             /* Remove any existing block */
             blocks.remove_all ();
             playing_field.remove_all ();
+            shape_shadow = null;
 
             /* Add in the current blocks */
             if (game.shape != null)