[OoT] Collision exporter tries to write to the extracted folder

[Reonu]

With this configuration:

the OoT collision exporter tries to write to the extracted folder instead of just the assets folder:

[Yanis002]

that issue is related to #609, the real issue for both is that fast64 always assumes the extracted folder is the way to go, instead it should look for existing folder/filenames in the normal assets folder first

[Yanis002]

I suspect this is getting fixed by #637 but I'm not sure