FIX: Store custom emojis as uploads.

* Depending on a hardcoded directory was a flawed design
  which made it impossible to debug when custom emojis go
  missing.

config/initializers/100-wrap_parameters.rb

@@ -12,4 +12,3 @@ end
 ActiveSupport.on_load(:active_record) do
   self.include_root_in_json = false
 end
-