[bilibili] Remove copyrighted test cases
[bilibili] Remove copyrighted test cases

I can't find any English or Chinese material that claims BiliBili has
bought legal redistribution permissions for copyrighted products from
copyrighted holders.

References for removed test cases:
"刀语": https://en.wikipedia.org/wiki/Katanagatari, by White Fox
"哆啦A梦": https://en.wikipedia.org/wiki/Doraemon, by Shin-Ei Animation
"岳父岳母真难当": https://en.wikipedia.org/wiki/Serial_(Bad)_Weddings, by Les films du 24
"混沌武士": https://en.wikipedia.org/wiki/Samurai_Champloo, by Manglobe

I shouldn't have added them to _TESTS

rg3/youtube-dl,pim89/youtube-dl,nickleefly/youtube-dl,Orochimarufan/youtube-dl,erikdejonge/youtube-dl,longman694/youtube-dl,codesparkle/youtube-dl,vijayanandnandam/youtube-dl,oskar456/youtube-dl,Tatsh/youtube-dl,ping/youtube-dl,malept/youtube-dl,rrooij/youtube-dl,yan12125/youtube-dl,Tithen-Firion/youtube-dl,gnowxilef/youtube-dl,gnowxilef/youtube-dl,dstftw/youtube-dl,hakatashi/youtube-dl,fluxw42/youtube-dl,nickleefly/youtube-dl,ping/youtube-dl,epitron/youtube-dl,spvkgn/youtube-dl,hakatashi/youtube-dl,ozburo/youtube-dl,spvkgn/youtube-dl,stannynuytkens/youtube-dl,kidburglar/youtube-dl,dstftw/youtube-dl,Tatsh/youtube-dl,remitamine/youtube-dl,TRox1972/youtube-dl,steebchen/youtube-dl,unreal666/youtube-dl,malept/youtube-dl,nyuszika7h/youtube-dl,luceatnobis/youtube-dl,vijayanandnandam/youtube-dl,mxamin/youtube-dl,kidburglar/youtube-dl,ozburo/youtube-dl,Tithen-Firion/youtube-dl,epitron/youtube-dl,Orochimarufan/youtube-dl,stannynuytkens/youtube-dl,luceatnobis/youtube-dl,vinegret/youtube-dl,steebchen/youtube-dl,aeph6Ee0/youtube-dl,rg3/youtube-dl,phihag/youtube-dl,gkoelln/youtube-dl,gkoelln/youtube-dl,fluxw42/youtube-dl,longman694/youtube-dl,coreynicholson/youtube-dl,jbuchbinder/youtube-dl,coreynicholson/youtube-dl,vinegret/youtube-dl,TRox1972/youtube-dl,fast90/youtube-dl,marcwebbie/youtube-dl,erikdejonge/youtube-dl,codesparkle/youtube-dl,remitamine/youtube-dl,jbuchbinder/youtube-dl,oskar456/youtube-dl,aeph6Ee0/youtube-dl,pim89/youtube-dl,mxamin/youtube-dl,marcwebbie/youtube-dl,phihag/youtube-dl,nyuszika7h/youtube-dl,fast90/youtube-dl,yan12125/youtube-dl,unreal666/youtube-dl,rrooij/youtube-dl