Updated parallax test screenshots to match latest behavior.

This corresponds to https://github.com/o3de/o3de/pull/9292 "Removed PDO Shadow Bias That Is Obsolete". Also, some aspects of the screenshots have been updated that weren't necessarily impacted by the depth bias changes, but more for routine maintenance to make sure the baselines match recent behavior that looks correct.

Signed-off-by: santorac <[email protected]>

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