Remove backlog lists from factories

spec/factories/boards.rb

@@ -3,7 +3,6 @@ FactoryGirl.define do
     project factory: :empty_project
 
     after(:create) do |board|
-      board.lists.create(list_type: :backlog)
       board.lists.create(list_type: :done)
     end
   end

spec/factories/lists.rb

@@ -6,12 +6,6 @@ FactoryGirl.define do
     sequence(:position)
   end
 
-  factory :backlog_list, parent: :list do
-    list_type :backlog
-    label nil
-    position nil
-  end
-
   factory :done_list, parent: :list do
     list_type :done
     label nil