Fix tie_word_embeddings handling for GGUF models

[Isotr0py]

What does this PR do?

• Some models like Llama-3.2-1B-Instruct-IMat-GGUF use tie_word_embeddings=True, but current GGUF model conversion didn't handle it and set to default value tie_word_embeddings=False.
• This PR fix the tie_word_embeddings handling for GGUF models

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@SunMarc

[SunMarc]

LGTM ! Thanks ! Is there an specific issue linked to this ?

[Isotr0py]

I think there is not, I just realized this when trying to migrate test_ggml.py to use Qwen2.5-0.5B for dequantization tests, because it generates totally gibberish outputs.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[LysandreJik]

Cool, thanks @Isotr0py!