the code that gets site keys from HSPH filters returns this part of the key as a string if it's like "08" and a number if it's like "10".  Rather than follow some existing code that does the same thing in a couchview in order to handle this, I thought I'd just change the key always be a string and simply emit the string stored in a form/case that corresponds to this value instead of doing that conversion.

Didn't want to refactor anything else due to it not seeming that important / view reindexing / it might take a while etc etc