Fix quilt mod discarding fabric sha512, checking bundled mods for updates

[LostLuma]

Fixes quilt mod not returning the fabricResult and makes it ignore bundled mods on loader >=0.18.1 by ensuring only a single .jar source file exists instead of simply using the first .jar.

I've tested this on both 0.17.11 and 0.18.1-beta.78 and it works fine.

[Prospector]

Thanks! That was a silly mistake lol