A temporary fix to windows unittests failing in INaturalistTestCase.

[GdoongMathew]

Summary

Temporary fix issue where tmp directory couldn't be removed during testing.
https://github.com/pytorch/vision/actions/runs/14085345925

cc @NicolasHug (Not sure if this kind of temp fix is needed)

[pytorch-bot]

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[GdoongMathew]

Update:
So the root cause is because of the loader argument. The loader was stored in the INaturalist attribute before the function is being mocked, and that's why the unittests failed. Once I changed to setting the loader during __getitem__, the issue no longer exists.

[NicolasHug]

Thanks a lot @GdoongMathew

[github-actions]

Hey @NicolasHug!

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