Don't need to use WADFILENUM/LUMPNUM in this function, since...

Don't need to use WADFILENUM/LUMPNUM in this function, since W_CheckNumForNamePwad returns just the lump number, not a combined WAD + lump number frankenstein's monster

This is just in case someone actually tries to dump in C_START/C_END and "add" colormaps using them, not that they would ever be used currently anyway.