This fixes PPS parser unit test case that retrieves PPS id from slice header.
Bug: webrtc:14951
Change-Id: I7aeea9fe15307a683e71f4c4f3c4b89d0471eda4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/255904
Commit-Queue: Erik Språng <sprang@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39437}