Remove redundant backend checks in training_args.py

[kevint324]

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What does this PR do?

Fixes #28109

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 write any new necessary tests?

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@ArthurZucker @muellerzr

[HuggingFaceDocBuilderDev]

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[muellerzr]

Thanks @kevint324! Overall this looks fine but let's fix the failing quality checks!

pip install -e .[quality]; make fixup;

[kevint324]

@muellerzr Done. After make fixup; a extra import is removed.

Thanks

[kevint324]

I looked into the failed case and found the casue.

In my PR I removed the calls to self.device within the if statements which calls _setup_devices to do some initialization.

[kevint324]

I've no idea why test_offline.py : test_offline_mode still fails.

I tried it on main and it still failed. @ArthurZucker

[LysandreJik]

Failing tests are independent of the changes, merging