`name_fields()` should use a person_type of `individual` not `ALIndividual`

[nonprofittechy]

person_type isn't meant to map to a Python class, so using the class name here is confusing.

I don't think this is a hard change to make as not much, if anything, should count on person_type being ALIndividual. The only checks we have in our code for person_type are for business or organization. But we should do a search more broadly for usage by other organizations.