[tasque] Remove superfluous Preferences ref from AllCategory

[Antonius Riha <antoniusri src gnome org>]

commit 821a2edc0017ada4b0bbe5508e199bd67a3be8b8
Author: Antonius Riha <antoniusriha gmail com>
Date:   Thu Jan 3 17:51:24 2013 +0100

    Remove superfluous Preferences ref from AllCategory

 src/libtasque/AllCategory.cs |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/src/libtasque/AllCategory.cs b/src/libtasque/AllCategory.cs
index e080c25..34d0ebe 100644
--- a/src/libtasque/AllCategory.cs
+++ b/src/libtasque/AllCategory.cs
@@ -14,14 +14,11 @@ namespace Tasque
 		// from all categories will be shown.  Otherwise, only tasks from the
 		// specified lists will be shown.
 		List<string> categoriesToHide;
-
-		Preferences preferences;
 		
 		public AllCategory (Preferences preferences)
 		{
 			if (preferences == null)
 				throw new ArgumentNullException ("preferences");
-			this.preferences = preferences;
 			categoriesToHide =
 				preferences.GetStringList (Preferences.HideInAllCategory);
 			categoriesToHide = preferences.GetStringList (Preferences.HideInAllCategory);