Minor update of `run_call_with_unpacked_inputs`
# What does this PR do?

Use `type(self).__name__` instead of `str(self).lower()`.

This is a follow-up of [this comment](https://github.com/huggingface/transformers/pull/18097#discussion_r926907848) by @gante.
_The documentation is not available anymore as the PR was closed or merged._<|||||>Thanks for making the change 👍 