Enable folderfiltering for MailDir repositories too

Currently we only filtered IMAP repositories, this patch enables filtering
for Maildir repositories too.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

offlineimap/repository/Maildir.py

@@ -173,6 +173,12 @@ class MaildirRepository(BaseRepository):
                                                            foldername,
                                                            self.getsep(),
                                                            self))
+                # filter out the folder?
+                if not self.folderfilter(foldername):
+                    self.debug("Filtering out '%s'[%s] due to folderfilt"
+                               "er" % (foldername, self))
+                    retval[-1].sync_this = False
+
             if self.getsep() == '/' and dirname != '':
                 # Recursively check sub-directories for folders too.
                 retval.extend(self._getfolders_scandir(root, foldername))