Reset post list on refresh
Reset post list on refresh to prevent doubling of if refresh used.
Throw in a button to refresh the feed (I copied the one that shows on error). Refresh the content and watch it change up several times.
This ensures this can't happen by clearing the list anytime we try to fetch a new set of rss feeds.
Reviewers: laysrodrigues, patrickelectric, tcanabrava
Reviewed By: patrickelectric, tcanabrava
Differential Revision: https://phabricator.kde.org/D17819