Fix auto-marking of played downloaded podcasts when connected via a local socket.
BUG: 554


git-svn-id: http://cantata.googlecode.com/svn/trunk@5507 b1e49159-3266-923f-9c3e-04f16369770a
Only check file if it MPD is connected via local socket, and file starts with /


git-svn-id: http://cantata.googlecode.com/svn/trunk@5508 b1e49159-3266-923f-9c3e-04f16369770a