ConnectionListener's closed not invoked when connection is lost

When the IMAP server closes a connection while the `IdleManager` is waiting (watching), the `ConnectionListener`'s `closed` is not invoked.

Here's a stack trace from this condition:

```
DEBUG IMAP: IdleManager got exception for folder: imap://xxxxxxxx/INBOX, THROW:
jakarta.mail.FolderClosedException: * BYE Jakarta Mail Exception: java.net.SocketException: Connection reset
at org.eclipse.angus.mail.imap.IMAPFolder.handleIdle(IMAPFolder.java:3309)
at org.eclipse.angus.mail.imap.IdleManager.processKeys(IdleManager.java:351)
at org.eclipse.angus.mail.imap.IdleManager.select(IdleManager.java:262)
at org.eclipse.angus.mail.imap.IdleManager.access$200(IdleManager.java:111)
at org.eclipse.angus.mail.imap.IdleManager$1.run(IdleManager.java:140)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
```

Going through the code, there's nothing that invokes the listeners.

**To Reproduce**
Steps to reproduce the behavior:

1. Setup IMAP server that closes connections after some idle time
2. Open folder
3. Add ConnectionListener to the folder
4. IdleManager.watch folder

**Expected behavior**
The closed method of all ConnectionListeners added to the folder should be invoked.