is_electron_species logic a bit off

[David Dickinson]

https://bitbucket.org/gyrokinetics/gs2/src/142c78781c1bc4c06d234b32fee70eaf100d68e4/src/species.f90#lines-1029

shows that we check if any of the species types of passed species is electron like. This any is unnecessary as we only accept a scalar species type. It should give the right answer but appears to show the wrong intent.