Fix user archive takeouts when using OpenStack Swift (#24431)

app/controllers/backups_controller.rb

@@ -13,7 +13,7 @@ class BackupsController < ApplicationController
     when :s3
       redirect_to @backup.dump.expiring_url(10)
     when :fog
-      if Paperclip::Attachment.default_options.dig(:storage, :fog_credentials, :openstack_temp_url_key).present?
+      if Paperclip::Attachment.default_options.dig(:fog_credentials, :openstack_temp_url_key).present?
         redirect_to @backup.dump.expiring_url(Time.now.utc + 10)
       else
         redirect_to full_asset_url(@backup.dump.url)