Materials: Fix depth state not set correctly with transparent meshes

[Popov72]

See https://forum.babylonjs.com/t/flag-depth-writemask-not-reset-after-draw-mesh/38377

The depth write mask was not reset correctly when a transparent material was forcing depth writting.

[bjsplat]

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To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

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