Fix todo to ensure TransportSequence numbers are generated if CCFB according to RFC 8888 is used. Transport sequence numbers are used in BWE algorithms regardless of feedback format. Bug: webrtc:42225697 Change-Id: I6eab95c0241d590f6e7a90d19c82d13ab8692f2b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/370341 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43515}