Fix ambient sound never starting

[Baker]

[Spike]

tbh I'm not sure anyone would really mind if those sounds were removed right now. they're too loud, too annoying, and flood through too much of the map, imho.
standing on the start spot, what I hear is both ambience/water1.wav and ambience/wind2.wav
that single spot has both full volume water+sky ambient volumes. which kinda demonstrates all that is wrong with leaf-based ambient sounds - its just noise.
most qw players use ambient_level 0 - many of them without even realising that this isn't even the vanilla default.

that += bug works both ways. you can also find yourself stuck with high ambient noise even in areas that should have none.

the fix I used was to do the += using a float instead (and then copy that into the master_vol value). you'd need a muuuuch higher framerate for any issues then.

[Baker]

Heh I agree with all of that!

1) Yeah, ProQuake has a "no ambient sounds" setting in preferences.
2) Likewise, I removed the "int"