Change unpacking of TF mobilebert inputs to use decorator

[vumichien]

What does this PR do?

As part of #16051 this PR changes the unpacking of the inputs of TF mobilebert to use the decorator instead.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you make sure to update the documentation with your changes? Here are the
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  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@Rocketknight1 @gante

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[gante]

Thank you for tackling this <3 Two things:

1. Tests are failing due to formatting -- make fixup should fix it
2. Can you confirm that RUN_SLOW=1 py.test -vv tests/[model_name]/test_modeling_tf_[model_name].py runs?

[vumichien]

@gante I have run the test and all pass. But when I run make fixup in my windows laptop it throws the error -n was unexpected at this time. make: *** [Makefile:10: modified_only_fixup] Error 255 Do you know how to fix it?

[gante]

@gante I have run the test and all pass. But when I run make fixup in my windows laptop it throws the error -n was unexpected at this time. make: *** [Makefile:10: modified_only_fixup] Error 255 Do you know how to fix it?

Check our guide here :)

[gante]

will merge as soon as CI turns green 👍

[vumichien]

Thank you :D