[vporn] Fixed extractor

[JChris246]

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Fixed extractor vporn

vporn video page setup which caused parsing description, uploader, view count, duration, video_urls and thumbnail to fail; fixed so it parses description, uploader, view count, duration and thumbnail correctly. vporn will also grab all available qualities which generic extractor will not. fixes #16276

[dstftw]

Generic extractor have no problems extracting all html5 formats. Extractor should be removed.

[Wiiplay123]

Generic extractor can't get the uploader information, though, which makes it impossible to sort by uploader.