[mod] Fix Libgen + Uncomment Ebay and Urbandictiorany (#2986)

- Change Libgen provider and use https by default.
- Umcomment Urbandictionary but disable it by default, it is working.
- Uncomment Ebay as it is working correctly.
(For ebay in the future: base_url should be changed from settings.yml  just like peertube or invidious)