enforce original size to be a list
Author: dom-dziela
Pull request: yes

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Fixes  [#33531](https://github.com/huggingface/transformers/issues/33531)
Changes the datatype of `original_size` from `torch.tensor(original_size, dtype = torch.int64)` to a list. This prevents possible calculation inaccuracies induced by hardware- and torch-versions, as in issue above, by conducting calculation in base python.

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Comments:
If I run `make fix-copies` the changes are deleted. Am I doing something wrong? Sorry first PR :) 

@dom-dziela Ah, I forgot this is LLaVa-OV. The modified function has a `# Copied from transformers.models.llava_next.modeling_llava_next.unpad_image` just above, so you'd need to fix the same function in llava-next and run `make fix-copies` again 🤗   

@dom-dziela Thanks a lot! Can you pls also propagate changes to llava-next-video model? My bad that it didn't propagare automatically with `make fix-copies`

Also, requested review from core maintainer, after their approval we can merge

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_33564). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.