Change taxon page map verifiable/unverifiable functionality

[bouteloua]

I’ll just copy some of @rupertclayton’s relevant text, since it looks like that bug was resolved (right?).

@rupertclayton

I agree that it’s better not to add too many checkbox options. My preference would be that iNat chooses complementary criteria so that checking all three boxes ensures that every observation for that taxon is shown. How about these three buckets?

1. Verifiable Observations
2. Observations w/o Media
3. Other Casual Observations

The last one would be all non-verifiable observations that don’t meet the criteria for #2.

I’ll also add that I don’t want to see spam, copyright infringement, opted out maverick IDs, and other casual grade observations on taxon page range maps; I think I’m happy with the current set of choices.