remove doubling of genus if requesting genus and species

[AstrobioMike]

"Species", at least for NCBI, includes the genus too. So when specifying, e.g. -L Genus,Species, it adds the genus twice.

I should put in something that accepts the input but fixes it under the hood, or tells the user they probably don't want that

[AstrobioMike]

note for fix in the future, if they have genus and species in the list, just remove genus