[Bug 48312] Add a "Reset" button to the WINE Config UI.

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48312

--- Comment #1 from Nikolay Sivov  ---
One issue is that winecfg itself is running in prefix you're about to remove.
Various projects that help to maintain prefixes/wine builds are running as
regular applications, so it's not a problem there.
> From usability perspective this does not seem to be easier, you'll have to set

WINEPREFIX, then run winecfg in it just to remove it, as opposed to just
removing it.