Fix validation routine for toolbar
Fix validation routine for toolbar

Was broken since transition to Swift 4.2 (commit 328a8c9) - Vienna 3.5.4
ViennaRSS/vienna-rss,ViennaRSS/vienna-rss,barijaona/vienna-rss,josh64x2/vienna-rss,josh64x2/vienna-rss,Eitot/vienna-rss,barijaona/vienna-rss,ViennaRSS/vienna-rss,Eitot/vienna-rss,ViennaRSS/vienna-rss,Eitot/vienna-rss,barijaona/vienna-rss,josh64x2/vienna-rss,josh64x2/vienna-rss,ViennaRSS/vienna-rss,barijaona/vienna-rss,Eitot/vienna-rss,josh64x2/vienna-rss,barijaona/vienna-rss