remove redundant `add_special_tokens` arg to avoid warning
Author: hiaoxui
Pull request: yes

# What does this PR do?

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Fixes #29273

The `add_special_tokens` argument is deprecated in the base class, so LlamaTokenizer should not pass this argument to the method `super().tokenize`.

The warning disappears after removing this argument. 


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      Pull Request section?
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      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?

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- text models: @ArthurZucker and @younesbelkada
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Library:

- flax: @sanchit-gandhi
- generate: @gante
- pipelines: @Narsil
- tensorflow: @gante and @Rocketknight1
- tokenizers: @ArthurZucker
- trainer: @muellerzr and @pacman100

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Comments:
This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

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Closing as completed!