pv-wrap: Replace --deterministic with SRT_LOG=diffable

Simon McVittie requested to merge wip/smcv/diffable into main

This serves the same function: sacrifice speed for predictability in order to get logs that can be compared line-by-line.

This is technically a CLI compatibility break, but --deterministic has not yet been in a public SLR release, and this is a developer-only option rather than something that steamrt/steamlinuxruntime> would ever use.

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