[addons] Remove broken last.FM musicvideo scraper
[addons] Add theaudiodb.com musicvideo scraper
[addons] Change default musicvideo scraper from the broken last.fm to theaudiodb.com. In case last.fm was still in use replace it with theaudiodb.com
Merge pull request #2113 from MartijnKaijser/scraper_change

Change default musicvideo scraper because it's broken