fix #857 and further refactoring for better done view

lib/login_system.rb

@@ -188,7 +188,6 @@ module LoginSystem
   end
   
   def basic_auth_denied
-      response.headers["Status"] = "401 Unauthorized"
       response.headers["WWW-Authenticate"] = "Basic realm=\"'Tracks Login Required'\""
       render :text => t('login.unsuccessful'), :status => 401
   end

lib/tracks/todo_list.rb

@@ -25,7 +25,7 @@ module Tracks
     end
 
     def find_done_todos
-      self.todos.find_in_state(:all, :completed, :order => "todos.completed_at DESC", :limit => self.user.prefs.show_number_completed)
+      self.todos.completed.all(:order => "todos.completed_at DESC", :limit => self.user.prefs.show_number_completed)
     end
   
     def not_done_todo_count(opts={})