Delete a couple unused accessors

At least, I think they are!

app/models/closet_visibility.rb

@@ -1,7 +1,6 @@
 module ClosetVisibility
   class Level
     attr_accessor :id, :name
-    attr_writer :description
 
     def initialize(data)
       data.each do |key, value|

app/models/pet.rb

@@ -12,7 +12,6 @@ class Pet < ApplicationRecord
   belongs_to :pet_type
 
   attr_reader :items, :pet_state
-  attr_accessor :contributor
 
   scope :with_pet_type_color_ids, ->(color_ids) {
     joins(:pet_type).where(PetType.arel_table[:id].in(color_ids))