has_human should differentiate based on data_type

[antgonza]

A user is having issues downloading a raw artifact because it's marked as having human data by has_human but it doesn't as it's 16S.

[antgonza]

This is done here: https://github.com/qiita-spots/qiita/pull/3395/files#diff-6b48eaa394aba9a44b7a5b042bae46413deb48e4e46e1e5765635e2318567a32R1582-R1585