fix tied_params for meta tensor
# What does this PR do?
This PR fix the retrieval of `tied_params` when we load a model with accelerate. The issue was that we were not able to retrieve the tied parameters by using the `id` function to check equality between meta `tensor`. Instead, we use `find_tied_parameters` from accelerate library. 

Solves [#1772](https://github.com/huggingface/accelerate/issues/1772)
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