[fix] utils/searx.sh install settings - do not eval the template

The settings template in utils/templates/etc/searx/settings.yml
does not include any replacements (shell environment variables).

BTW: utils/filtron.sh & utils/lib.sh
  Add some more messages to installation procedures, to be more clear.

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