Bring the naming scheme of CORSIKA cosmic fcl inline with the rest of sbndcode
The naming scheme of our fcl files is generally prod[GENERATOR]_[PARTICLETYPE]_[STUFF].fcl
Cosmic fcls (excluding production ones), both CORSIKA and cry based, do not follow this scheme. They follow prodcosmics_[GENERATOR]_[STUFF].fcl.
I think that they should follow the rest of the naming scheme.