fix: move super().__init__ after vision_config init in Mistral3Config
Author: starcatmeow
Pull request: yes

# What does this PR do?

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Fixes #40062 


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [x] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#create-a-pull-request),
      Pull Request section?
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      to it if that's the case. #40062 
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- [ ] Did you write any new necessary tests?


## Who can review?

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- @ArthurZucker 
- @zucchini-nlp
- @Cyrilvallez

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HF projects:

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- diffusers: [different repo](https://github.com/huggingface/diffusers)
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Comments:
**[For maintainers]** Suggested jobs to run (before merge)

run-slow: mistral3

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