[Physics] Fix warning on copying a mesh with physics body

[carolhmj]

We need to pass the transform node of the body when cloning it.
Related forum issue: https://forum.babylonjs.com/t/havoc-problems-with-parented-meshes/40584/18?u=carolhmj
Test PG: https://playground.babylonjs.com/#Z8HTUN#396
In master, it displays these warnings:

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

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