Fix examples/Calculating MLIP properties.ipynb using ML-relaxed structure for next model in loop

[rul048]

I think the correct code logic here is reloading the initial structure for each uMLIPs to do a series of calculations. But in the previous codes, CHGNet used the final structure relaxed by M3GNet.

Summary

Major changes:

• feature 1: ...
• fix 1: ...

Todos

If this is work in progress, what else needs to be done?

• feature 2: ...
• fix 2:

Checklist

• Google format doc strings added. Check with ruff.
• Type annotations included. Check with mypy.
• Tests added for new features/fixes.
• If applicable, new classes/functions/modules have duecredit @due.dcite decorators to reference relevant papers by DOI (example)

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