SSAO2 blur shader issues

[Evgeni_Popov]

@Evgeni_Popov

I have a PR in progress (for SSR) that will let change the precision of this texture, but in the meantime you can force using the geometry buffer:

Note that since 5.51.0, the depth texture of the pre-pass renderer is now 32 bits. So, this PG now works without the artifacts for the towel:

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