mpv: Remove setting of 'sotfvol'.
mpv: Remove setting of 'sotfvol'.

With mpv 0.18.1, volume control was forced to softvol, and the --softvol option
was removed [1]. The removal of 'softvol=yes' from the configuration file fixes
the following mpv warning:

    Warning: option --softvol is deprecated and might be removed in the future
    (no replacement).

[1] https://github.com/mpv-player/mpv/wiki/FAQ#i-want-the-old-pulseaudio-volume-control-back-on-linux

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