[fix] engine archive is - search_url has been changed

BTW: set soft_max_redirects from *archive is* by 1, to prevent logging::

    DEBUG:httpx._client:HTTP Request: GET https://archive.is/search/?q=www.python.org "HTTP/2 302 Found"
    DEBUG:httpx._client:HTTP Request: GET https://archive.is/www.python.org

 "HTTP/2 200 OK"
    DEBUG:searx:archive is: ErrorContext('searx/search/processors/online.py', 110, 'count_error(self.engine_name,', None, '1 redirects, maximum: 0', ('200', 'OK', 'archive.is')) True

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>