[offlineimap] IMAP flags are not synced (#209)

[ojab]

1. Make IMAP account
2. Create a letter: 
 ```
C: RUBY0004 UID FETCH 2 flags
S: * 1 FETCH (UID 2 FLAGS (\Seen \Draft $NotJunk NotJunk))
```

3. Add flag from Apple's Mail.app
 ```
C: RUBY0004 UID FETCH 2 flags
S: * 1 FETCH (UID 2 FLAGS (\Flagged \Seen \Draft $NotJunk NotJunk $MailFlagBit0))
```
4. Sync mailbox to another one using offlineimap v6.5.7 with [this config](https://gist.github.com/ojab/499ceb5e2c88da81ce58) ([log with `-d ALL`](https://gist.github.com/ojab/0e6458c093d0a189a9e4))
5. Check a letter in the new mailbox:
 
 ```
C: RUBY0004 UID FETCH 1 flags
S: * 1 FETCH (UID 1 FLAGS (\Flagged \Seen \Draft))
```

IMAP server is dovecot-2.2.10 here.

---
Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/issues/209
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