Fix load_model missing argument

[bot66]

What does this PR do?

Add the missing argument use_fast_kernels to the load_model function in chat completion inference example script

invoke:
https://github.com/facebookresearch/llama-recipes/blob/ce3c2ec4285d2b3626534b753b1a37e92049d31a/examples/chat_completion/chat_completion.py#L64

definition:
https://github.com/facebookresearch/llama-recipes/blob/ce3c2ec4285d2b3626534b753b1a37e92049d31a/src/llama_recipes/inference/model_utils.py#L8

Fixes # (issue)
Fix load_model missing argument

Feature/Issue validation/testing

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