Remove optional action_cable setting, since we don't use action_cable

Author: robbevp

config/environments/development.rb

@@ -52,8 +52,5 @@
   # routes, locales, etc. This feature depends on the listen gem.
   config.file_watcher = ActiveSupport::EventedFileUpdateChecker
 
-  # Uncomment if you wish to allow Action Cable access from any origin.
-  # config.action_cable.disable_request_forgery_protection = true
-
   config.token_hash_rounds = 10
 end