Pace at max of BWE and lower link capacity only when loss based estimate is not less than delay based estimate.

It is hard to add an unit test for this change, because OnTransportPacketsFeedback is the way to change the loss based estimate, and it also changes the lower link capacity.

Thus we cannot track the two values without making changes in goog_cc, which seem to be unecessary.

Bug: none
Change-Id: I689ef52c4440c9bc2ff30f88b9cda96a90b0b64e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/256368
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Diep Bui <diepbp@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36304}