Properly clean up sanitized web server logs in the recent/ directory

Looks like we forgot to properly implement the part where we clean up sanitized web server logs in the recent/ directory. They just pile up there and are not deleted when they turn older than three days. That's different from all other modules.

See CollecTor's index file which contains lots and lots of not-as-recent sanitized web server logs.

I'll post a branch in a minute. Let's put out a release with this fix within the next week or so.