Volume level not honored after song reach the end
Initially reported on https://governance.funkwhale.audio/d/SeUDP7vM/funkwhale-0-21-release-incoming-looking-for-testers-/14
Listen to a song at 100% volume, then wait for the next song to change and change the volume to ~25%, and wait for the end of the song: hear it's back to 100% (or something not 25%), but the slider didn't change.