[mod] improve setup of invidious engine

- My experience is, that a timeout of 5 sec is not need, I got fast response
  less than a second.

- https://invidious.tube/ redirects to http://ww25.invidious.tube/
  - in SearXNG defaults the http protocol is unsafe and raise an error
  - https://ww25.invidious.tube has SSL_ERROR_UNSAFE_NEGOTIATION

Related-to: https://github.com/searxng/searxng/issues/821


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