Fixed "uid_validity updated unexpectedly" errors when mbox file was being recreated and index files still existed.
Fixed "uid_validity updated unexpectedly" errors when mbox file was being
recreated and index files still existed.

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