delete if original_filename as explained in https://github.com/carr…

…ierwaveuploader/carrierwave/blob/master/README.md#changing-the-filename

lib/generators/templates/uploader.rb.erb

@@ -42,6 +42,6 @@ class <%= class_name %>Uploader < CarrierWave::Uploader::Base
   # Override the filename of the uploaded files:
   # Avoid using model.id or version_name here, see uploader/store.rb for details.
   # def filename
-  #   "something.jpg" if original_filename
+  #   "something.jpg"
   # end
 end