Not support remap source from Intermediary name to mojang name when using forge platform

[vfyjxf]

Projects built with the arch loom output source jars that use the Intermediary name, but the loom will only map the Intermediary to the srg name, not the named.

eg:(From kubeJs)

[vfyjxf]

This problem does not exist when using yarn or quilt mapping, only when using mojang mapping (or derived mapping).