Fix check_quantized_param method when param_value is a safetensors slice

[radulescupetru]

What does this PR do?

Fixes a case where when loading a quantized model from safetensors with tensor parallelism enabled (device_mesh!=None) , check_quantized_param(...) method was failing as it was expecting a torch.Tensor as input for param_value and it was supplied with a slice.
More details: #40361

Fixes #40361

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  to it if that's the case. - Quantized model loading failing with custom device mesh #40361
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@SunMarc @S1ro1

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[For maintainers] Suggested jobs to run (before merge)

run-slow: bnb, eetq_integration, fbgemm_fp8, finegrained_fp8, higgs