lib-storage: Fixed mailbox_list_mailbox() for INBOX in under non-root mail dir.
lib-storage: Fixed mailbox_list_mailbox() for INBOX in under non-root mail dir.

jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot