Always enforce the minimum input volume, not only if overridden. The only exception is when the applied input volume is zero: in that case zero is still recommended. This CL also adapts the unit tests and replaces "mic level" with the "input volume". Bug: webrtc:7494 Change-Id: I20c14624fbd357ab91ea05521c3723ec1045a8db Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/285462 Reviewed-by: Hanna Silen <silen@webrtc.org> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38769}