If max allocated bitrate change, default max limit probe to 2x current BWE. Bug: webrtc:369044000, b/370883514 Change-Id: Ibaf79fff94157186002728828d6574bea21afd24 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/368820 Commit-Queue: Per Kjellander <perkj@webrtc.org> Reviewed-by: Diep Bui <diepbp@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43448}