#772: Problem with $path_func in Log filters

Maybe a better way
than explicitly setting a filter $path is to find a way to refactor/re-use
the code in `default_path_func` that transforms the Log::ID into a default
path and then call out to it from the new path_func.

Ah! You're right. I'll fix it.

Not sure what my problem is today, I don't seem to be able to remove the bro-dev list when I send mail to the tracker!