[youtube] Fix categories and improve tags extraction
[youtube] Fix categories and improve tags extraction

Orochimarufan/youtube-dl,ozburo/youtube-dl,Orochimarufan/youtube-dl,rg3/youtube-dl,yan12125/youtube-dl,nyuszika7h/youtube-dl,Tatsh/youtube-dl,spvkgn/youtube-dl,ozburo/youtube-dl,nyuszika7h/youtube-dl,Tatsh/youtube-dl,rg3/youtube-dl,spvkgn/youtube-dl,yan12125/youtube-dl