FileChooser: allow traversing unreadable directories
FileChooser: allow traversing unreadable directories

koreader/koreader,poire-z/koreader,pazos/koreader,Markismus/koreader,Hzj-jie/koreader,koreader/koreader,Frenzie/koreader,mwoz123/koreader,NiLuJe/koreader,Frenzie/koreader,poire-z/koreader,NiLuJe/koreader