Fix SSR and procedural textures clear order

[sebavan]

https://forum.babylonjs.com/t/ssr-with-noiseproceduraltexture-caused-scene-not-refreshing/31290

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[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]

Snapshot stored with reference name:
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[RaananW]

This seems to include the other PR you have open as well. Might cause a merge conflict.