Correcting a mistake in the dominant nearend detection where the meaning of the echo-to-nearend ratio was inversed. Bug: webrtc:8671 Change-Id: I7f56369fad1784e256150c312b6b3dafcb9d0f71 Reviewed-on: https://webrtc-review.googlesource.com/c/112136 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25818}