[downloads] remove obsolete hf param for using symlinks (local_dir_use_symlinks=False,) and avoid showing warning about it

[lessw2020]

This PR:
1 - removes the now obsolete local_dir_use_symlinks from the hf snapshot_download api call.
2 - this then removes the currently displayed long warning about using it which is shown to the user when running torchchat.py download...

Before this PR:

[[email protected] /data/users/less/local/chatmaster (main)]$ python torchchat.py download llama3
Downloading meta-llama/Meta-Llama-3-8B-Instruct from HuggingFace...
/home/less/local/miniconda3/envs/newserver/lib/python3.10/site-packages/huggingface_hub/file_download.py:1212: ****UserWarning: `local_dir_use_symlinks` parameter is deprecated and will be ignored. 
The process to download files to a local folder has been updated and do not rely on symlinks anymore. 
You only need to pass a destination folder as`local_dir`.
For more details, check out https://huggingface.co/docs/huggingface_hub/main/en/guides/download#download-files-to-local-folder**.**

After this PR - no warning, just downloading:

[[email protected] /data/users/less/local/chatmaster (main)]$ python torchchat.py download llama3.1
Downloading meta-llama/Meta-Llama-3.1-8B-Instruct from HuggingFace...

3 - two additional lines were auto reformatted by my VS code and I don't have control over that (auto does it whenever I save a file now) but no change in functionality there.

[pytorch-bot]

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