Change-Listener: listener.db_name is already URI-Encoded

[HitomiTenshi]

The change-listener process cannot find databases with plus signs in them (probably other special URI-Escaped signs as well). When trying to find the database the slouch dependency will use encodeURIComponent a second time on listener.db_name which will result in the database not being found.

I made a hacky fix here that undoes the first encodeURIComponent so that slouch can find the database:

HitomiTenshi@f24f263

Not sure if this is a good solution, but it does the job for now. If you want me to create a PR from that just say the word.