Port more search providers to HTTPS

Summary:
Those are mostly services with more complex URLs changes than just adding
the extra 's' to get to HTTPS. The exception is ethicle.com which redirects
to ecosia.com without supporting HTTPS itself, so just merge their desktop
files.

There are still a few ones left not using HTTPS now, but those services
actually seem to not support that at all. Do we want to support such
insecure services here at all?

Subscribers: kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D16946