#358 Cleanup doesn't work on one feed

[Dave Shepherd]

I'm trying to use Cleanup to get rid of old files, but it is simply not
working in one feed. I select files by checking them in the list, I hit
delete, but then nothing happens. The button is working fine for other
feeds: when I delete, iPodder takes the files out of my iTunes library
and also (presumably) from my iPodder downloads folder. But for
this one feed (annik_rubens.podspot.de/rss) it doesn't work at all.