Convert setting values that has been improperly converted to a dict back to a string.

def _normalize_server_settings(**settings):
    '''
    Convert setting values that has been improperly converted to a dict back to a string.
    '''
    ret = dict()
    settings = salt.utils.args.clean_kwargs(**settings)

    for setting in settings:
        if isinstance(settings[setting], dict):
            value_from_key = next(six.iterkeys(settings[setting]))

            ret[setting] = "{{{0}}}".format(value_from_key)
        else:
            ret[setting] = settings[setting]
    return ret