Fix validation of a menu item
Fix validation of a menu item

Contrarily to feeds fetched directly, feeds read through an OpenReader
server had the "Mark all articles as read" menu item always active.
josh64x2/vienna-rss,barijaona/vienna-rss,josh64x2/vienna-rss,barijaona/vienna-rss,Eitot/vienna-rss,barijaona/vienna-rss,josh64x2/vienna-rss,Eitot/vienna-rss,ViennaRSS/vienna-rss,Eitot/vienna-rss,josh64x2/vienna-rss,ViennaRSS/vienna-rss,ViennaRSS/vienna-rss,josh64x2/vienna-rss,Eitot/vienna-rss,barijaona/vienna-rss,ViennaRSS/vienna-rss,ViennaRSS/vienna-rss,barijaona/vienna-rss