fix corner case where recurring todo with due in future and show_from in past did not create corresponding todo

you cannot add todos with show_from in the past

test/functional/recurring_todos_controller_test.rb

@@ -18,5 +18,5 @@ class RecurringTodosControllerTest < ActionController::TestCase
     xhr :post, :destroy, :id => 1, :_source_view => 'todo'
     assert_rjs :page, "recurring_todo_1", :remove
   end
-    
+
 end