rust-status: ignored directories are now correctly only listed if opted into
This fixes the behavior of `hg purge` removing empty ignored directory even
without `--all` or `--ignored`.
skip ignored directories if -i or --all not specified
$ hg init t
$ cd t
$ echo 'ignored' > .hgignore
$ hg ci -qA -m init -d'2 0'
$ mkdir ignored
$ ls
ignored
$ hg purge -v --no-confirm
$ ls
ignored