Use only the mesh's enabled state, not its parent's, when cloning.

[carolhmj]

Related forum issue: https://forum.babylonjs.com/t/cloned-objects-dont-seem-to-have-the-same-enabled-state-as-the-original-object/32311

Example playground: https://playground.babylonjs.com/#48QWI6

[azure-pipelines]

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.

[azure-pipelines]

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