fix typo in auto wrap policy

[hiaoxui]

I think this might be a typo; there is no reason to write MllamaSelfAttnDecoderLayer twice. Let me know if it was intentional.

What does this PR do?

This fixes a typo as mentioned above.

Feature/Issue validation/testing

I tested with my local training script.

This is a minor change; I didn't write new tests.

Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [ x] Did you read the contributor guideline, Pull Request section?
• [ ] Was this discussed/approved via a Github issue? Please add a link to it if that's the case.
• [ ] Did you make sure to update the documentation with your changes?
• [ ] Did you write any new necessary tests?

Thanks for contributing 🎉!

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[wukaixingxp]

Hi! Thank you so much for this bug report. It is indeed a typo that should be fixed ASAP.

[wukaixingxp]

@hiaoxui Can you sign the CLA check so I can get this merged ASAP? Thanks!

[wukaixingxp]

@hiaoxui Thanks for your help! It will be merged now