GUI graphics Quality presets do not unset r_fastsky

[pardner]

Platform,OS: x86_64,
Engine/game version: SG v1.1

How to reproduce:

1. Launch Game, and start a map.
2. Press ESC to bring up the menu, and go to System
3. Click the graphics Quality presets until you reach Very Fast.
4. Hit Apply. You will see that r_fastsky has been set (black sky)
5. Press ESC to bring up the menu, and go to System
6. Click the graphics Quality presets until you reach High Quality.
7. Hit Apply. You will see that r_fastsky still is set (black sky)

Result:

Unable to clear r_fastsky via the GUI menu. I had to look up the cvar in the q3config. I am able to change it in game via /r_fastsky 0, so there is nothing wrong with the cvar function

Expected result:

Either make the high quality preset clear the r_fastsky, or make a separate GUI line for it. That way a new player who starts changing video quality does not think that our game only has black skies.