lib-storage: Fixed listescape when escape_char was the same as namespace separator.
lib-storage: Fixed listescape when escape_char was the same as namespace separator.

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