The minimum bitrate was lower bounded by the previous value and could thus not become lower when a stream allocation was removed.
Bug: None
Change-Id: I60068dbc7691121f001cbb233ca4a25269047f6e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/157424
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Jakob Ivarsson <jakobi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29541}