Fix Paperclip using deprecated URI.escape function (#13320)

Monkey-patch Paperclip to perform URL escaping in a slightly more
appropriate way, and get rid of runtime deprecation warnings.

config/application.rb

@@ -7,6 +7,7 @@ require 'rails/all'
 Bundler.require(*Rails.groups)
 
 require_relative '../app/lib/exceptions'
+require_relative '../lib/paperclip/url_generator_extensions'
 require_relative '../lib/paperclip/attachment_extensions'
 require_relative '../lib/paperclip/lazy_thumbnail'
 require_relative '../lib/paperclip/gif_transcoder'