Fix DS_Store Crash

This mod is a fix for DS_Store:sound.json crash on macos, it should happen on some mods which using external assets folder and does not check if is a directory, like kubejs.

Crash message should be looks like that: "net.minecraft.ResourceLocationException: Non [a-z0-9_.-] character in namespace of location: .DS_Store:sounds.json"

Simply put it into mods folder and get this crash out! If you have other minecraft version wants support, feel free to leave your comments!