Fix issue 596: Vienna was forgetting current folder/feed on termination
Fix issue 596: Vienna was forgetting current folder/feed on termination

Observer was removed too early in the process.
tothgy/vienna-rss,josh64x2/vienna-rss,ViennaRSS/vienna-rss,ViennaRSS/vienna-rss,Eitot/vienna-rss,tothgy/vienna-rss,Eitot/vienna-rss,dak180/vienna,dak180/vienna,josh64x2/vienna-rss,tothgy/vienna-rss,josh64x2/vienna-rss,barijaona/vienna-rss,josh64x2/vienna-rss,lapcat/vienna-rss,lapcat/vienna-rss,barijaona/vienna-rss,Eitot/vienna-rss,ViennaRSS/vienna-rss,barijaona/vienna-rss,dak180/vienna,barijaona/vienna-rss,Eitot/vienna-rss,barijaona/vienna-rss,dak180/vienna,tothgy/vienna-rss,josh64x2/vienna-rss,lapcat/vienna-rss,ViennaRSS/vienna-rss,lapcat/vienna-rss,ViennaRSS/vienna-rss