Fix indentation when setting self.msg_id

[gmoelter]

Setting of self.msg_id from config should not depend on the argument clean being True.

[gmoelter]

Maybe one should even go further and account for the possibility that unidecode has to be applied to the custom msg_id.

Hence, I would suggest the following:

            if self.clean:
                from text_unidecode import unidecode

                self._config['name'] = unidecode(self._config['name'])[:70]

                if self._config.get('msg_id'):
                    self._config['msg_id'] = unidecode(self._config['msg_id'])

            if self._config.get('msg_id'):
                self.msg_id = self._config['msg_id'][:35]