Fix parent transformations being applied to position/rotation deltas …

[carolhmj]

…on sixDofDragBehavior

Related forum issue: https://forum.babylonjs.com/t/strange-sixddrag-behavior-when-the-parent-is-normalized-to-unit-cube/47171

[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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