Multi-site install patch

The module doesn't work when installed in sites/somesite/modules (i.e. for a multi-site drupal install), because the module's function _contact_dir_get_fields can't find it's fields.inc file. Here's a simple fix to that function (in the contact_dir.module file) that seems fairly obvious and works so far.

function _contact_dir_get_fields() {
        $fields = array();
        $config = conf_init();
        $inc = 'modules/contact_dir/fields.inc';
        if (!file_exists($inc))
          $inc = "$config/$inc";
        if (file_exists($inc)) {
                include_once $inc;
                $fields = _contact_dir_fields();
        }
        return $fields;
}