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}
03bccbe62d