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.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot