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}