FIX: use 'freeze' method again to fix 'cant modify frozen string' error

FIX: use ‘freeze’ method again to fix ‘cant modify frozen string’ error

8d5c90014268fa9e625930740db2a17e2d018784

diff --git a/app/models/post.rb b/app/models/post.rb
index c7c57d4..7dbbe7e 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -1,4 +1,3 @@
-# frozen_string_literal: true
 require_dependency 'pretty_text'
 require_dependency 'rate_limiter'
 require_dependency 'post_revisor'
@@ -61,10 +60,10 @@ class Post < ActiveRecord::Base
   # We can pass several creating options to a post via attributes
   attr_accessor :image_sizes, :quoted_post_numbers, :no_bump, :invalidate_oneboxes, :cooking_options, :skip_unique_check, :skip_validation
 
-  LARGE_IMAGES      ||= "large_images"
-  BROKEN_IMAGES     ||= "broken_images"
-  DOWNLOADED_IMAGES ||= "downloaded_images"
-  MISSING_UPLOADS ||= "missing uploads"
+  LARGE_IMAGES      ||= "large_images".freeze
+  BROKEN_IMAGES     ||= "broken_images".freeze
+  DOWNLOADED_IMAGES ||= "downloaded_images".freeze
+  MISSING_UPLOADS ||= "missing uploads".freeze
 
   SHORT_POST_CHARS ||= 1200

GitHub sha: b0600e52