Send "Unmute" on volume change

[zv0n]

My monitor requires sending "Unmute" command over DDC after a volume change for that change to take effect.

I've added an option into the UI to enable this behavior.

Might fix problems for some people in this issue - #1369

[dimaqq]

My 2c, as an end user: the setting may be somewhat confusing.
If it's only a single monitor that needs this hack, I would consider following:

1. check if monitor firmware can be updated
2. ask on mastodon/reddit/twitter to see if monitors of other models / from other manufacturers need this
3. add some kind of clarification, e.g. send unmute on volume change (fixes Macintosh 512K display) or a url link to github issue where folks can report their monitors