Fix spacer formatter in podlist-format
Fix spacer formatter in podlist-format

The problem was two-fold:

1. a typo: the code was copy-pasted from FeedListFormaction, and
   "feeds:w" wasn't changed to "dls:s". I checked, and there are no
   other typos of this kind in this file;

2. the first time the loop is run, the widgets aren't painted yet, so
   they don't know their size. This can be rectified by force-repainting
   them, say, by downloading something. To fix the first run, I stuck
   a force-recalculation there. Shouldn't be a performance bottleneck
   since repaints don't happen often (every second during downloads, and
   as fast as user types commands).

Fixes #434.

der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat