[Dovecot] custom imap flags in maildir don't saved after upgrade to 1.1.10

[Anton Yuzhaninov]

Custom imap flags (like $label1, $label2 in mozilla TB) don't saved in maildir
after upgrade to 1.1.10.

In logs no errors obout this.

With mailbox custom flags works OK.

-- 
 Anton Yuzhaninov