Fixes the bug caused by the renaming of "nerve-roots-veins-dense" and "nerve-roots-veins-sparse" to "nerve-roots-dense" and "nerve-roots-sparse" in update 2.0.44

This means rjdunlap's planets won't spit out a error at game launch anymore.

Link to his profile: https://mods.factorio.com/user/rjdunlap

This was the original fix I based this mod off of: https://mods.factorio.com/mod/hexalith-fix