This hard-codes the behavior to mode 3 with a threshold of 0.5 like was
already done by FetchPreEchoConfiguration.
Bug: webrtc:14205
Change-Id: I48d47a77c9df0001460788b504524203417f9647
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/345483
Commit-Queue: Emil Lundmark <lndmrk@webrtc.org>
Reviewed-by: Jesus de Vicente Pena <devicentepena@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42015}
3fc8422993