Make "No, it's as good as it can be" take effect with fewer than 2 IDs

This happened in Jan 2018. I’m not sure if there was much background or discussion of the change, but I think it was a good one because I think that there should be a community opinion on what the appropriate taxon is before observations no longer deserve the attention of identifiers. I also think the issue of what can and cannot be “confirmed or improved” is even fuzzier than all the other DQA topics, almost all of which are already pretty fuzzy, and I suspect that’s why we give it a different visual treatment in the DQA. I almost never click these boxes except for my own observations because it’s extraordinarily hard to say that someone else with more knowledge of the taxon or the place could not add a better ID.