fix: llama4 conversion script no_rope_layers
Author: jmkuebler
Pull request: yes


# What does this PR do?
`no_rope_layers` should either be a list of NoPE layers or `None`, such that it is created in the config from the `no_rope_layer_interval`, see https://github.com/huggingface/transformers/blob/main/src/transformers/models/llama4/configuration_llama4.py#L338-L343 

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Fixes [(incompatibility issue)](https://huggingface.co/meta-llama/Llama-4-Scout-17B-16E-Instruct-Original/discussions/4)


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Comments:
Hi 👋, thank you for opening this pull request! The pull request is converted to draft by default. The CI will be paused while the PR is in draft mode. When it is ready for review, please click the `Ready for review` button (at the bottom of the PR page). This will assign reviewers and trigger CI.

@pcuenca I set the pr from draft to ready, but not sure this is how it should be done. Anything needed from my side still?

Yes, this is correct, merging. Thank you @jmkuebler!

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