Fix dataset in stable_diffusion_hybrid_quantization notebook

[l-bat]

What does this PR do?

stable_diffusion_hybrid_quantization notebook started failing after the PR#638 was merged.

Fix:

• Convert iterable dataset for quantization to list

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

[HuggingFaceDocBuilderDev]

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[l-bat]

cc @nikita-savelyevv, @ljaljushkin, @AlexKoff88

[echarlaix]

Thanks for the fix @l-bat