[rtlnl] Extend _VALID_URL for new embed URL schema
[rtlnl] Extend _VALID_URL for new embed URL schema

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