remove all calls to the distributed mutex in emojis

app/models/emoji.rb

@@ -85,12 +85,10 @@ class Emoji
   end
 
   def self.load_custom
-    DistributedMutex.new(EMOJIS_CUSTOM_LOCK).synchronize do
     Dir.glob(File.join(Emoji.base_directory, "*.{png,gif}"))
        .sort
        .map { |emoji| Emoji.create_from_path(emoji) }
   end
-  end
 
   def self.base_directory
     "public/#{base_url}"