ENGINES: Mute kPlainSoundType in Engine::syncSoundSettings()

The "Mute all" option rarely muted all audio streams, since we have
this abomination called kPlainSoundType (and there is no volume slider
for this type). Both, not-really-muting, and adding yet another slider is
a horrible user experience imho - especially on handheld ports.
So mute this sound in the default implementation, and unmute it to the
maximum volume.
When an engines has a volume level settings for sounds it plays with
this type, it should overwrite said member and set it there.

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