Only allow the application of min input volume if the applied input volume is above zero. To implement this, add a member variable to store the applied input volume. Rename the related setter to reflect its new functionality. Bug: webrtc:7494 Change-Id: Ia70d5cb4dfd972aad9ef2663a81884f3e5cb0758 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/287680 Reviewed-by: Alessio Bazzica <alessiob@webrtc.org> Commit-Queue: Hanna Silen <silen@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38878}