message: Remove account linking
diff: @@ -475,8 +475,9 @@ function Facebookbot(configuration) {
  },
  delete_account_linking: function () {
  var message = {
  - 'setting_type': 'call_to_actions',
  - 'thread_state': 'existing_thread'
  + "fields": [
  + "account_linking_url"
  + ]
  };
  facebook_botkit.api.messenger_profile.deleteAPI(message);
  },
  