create default imap folders

install/debian/roundcube-main.conf

@@ -437,6 +437,7 @@ $rcmail_config['trash_mbox'] = 'Trash';
 // these folders will also be displayed with localized names
 // NOTE: Use folder names with namespace prefix (INBOX. on Courier-IMAP)
 $rcmail_config['default_folders'] = array('INBOX', 'Drafts', 'Sent', 'Spam', 'Trash');
+$rcmail_config['default_imap_folders'] = array('INBOX', 'Drafts', 'Sent', 'Spam', 'Trash');
 
 // automatically create the above listed default folders on first login
 $rcmail_config['create_default_folders'] = true;