Fix `tie_word_embeddings` handling for GGUF models
Author: Isotr0py
Pull request: yes

# What does this PR do?

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- Some models like [Llama-3.2-1B-Instruct-IMat-GGUF](https://huggingface.co/legraphista/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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Comments:
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.

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