fix(qwen2vl): make Qwen2VLImageProcessor respect config['size'], align with fast version
Author: qianyue76
Pull request: yes

…n with Fast version\n\n修复：https://github.com/huggingface/transformers/issues/42910\nQwen2VLImageProcessor 不再覆盖 config["size"]，一致性对齐 Fast 处理，确保 Qwen3VL 正常。

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Fixes #42910 


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Comments:
**[For maintainers]** Suggested jobs to run (before merge)

run-slow: paddleocr_vl, qwen2_vl, video_llama_3

Hi, I submit a PR, could you have time to review it? @zucchini-nlp 

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_43095). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.