libfuse: handle singleTeam type in  `PathType`
libfuse: handle singleTeam type in  `PathType`

Otherwise, certain errors can cause a panic.

Found by modalduality

keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/kbfs,keybase/client