Revert datasets authentication tweaks
Once we update `datasets` to version 2.14.4, we no longer need the authentication tweaks (where we had to use `download_config` instead of `token`) introduced by:
- #1620
Revert datasets authentication tweaks: Once we update `datasets` to version 2.14.4, we no longer need the authentication tweaks (where we had to use `download_config` instead of `token`) introduced by:
- #1620