[Cohere2Vision] remove unused arg
Author: zucchini-nlp
Pull request: yes

# What does this PR do?

Cohere2 Vision doesn't use image patches anymore, but the arg was not removed. The image processor returns `num_patches` which is always popped when processing

We need to remove unused args to make sure vLLM backend works, otherwise an error is raised about missing required args

cc  @hmellor 

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Fixes # (issue)


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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_40103). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

Yeah, forgot to update tests probably, taking a look

**[For maintainers]** Suggested jobs to run (before merge)

run-slow: cohere2_vision