Ensure that the correct user token is being used for static object URLs

In the refactored blob viewer we use the external_storage_url field on the frontend for determining the the Open raw and Download hrefs.

However when running the when static objects external storage is enabled spec in spec/features/projects/blobs/blob_show_spec.rb with the refactor_blob_viewer feature flag enabled, it fails because the token that is being used does not match what is being tested (user.static_object_token) causing the test to fail.