Flip `RenderingSimulator::reuse_streams` to default false.

A recent learning is that this value should be set to true for
visualizations, but false for data analysis. Just out of safety, we
should therefore have it set to false by default, and then explicitly
set it to true when needed.

Bug: b/423646186
Change-Id: Idf7bd9280c48a6383aa86c50abc2a99e67d7580c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/447760
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Åsa Persson <asapersson@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Auto-Submit: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46850}