remove unused .h
remove unused .h

unityappstudio/VKVideoPlayer,andrewchae/VKVideoPlayer,kishanravindra/VKVideoPlayer,zcs110/VKVideoPlayer,yuj2015/VKVideoPlayer,Pingco/VKVideoPlayer,amikey/VKVideoPlayer,PlayForKobe/VKVideoPlayer,CaliosD/VKVideoPlayer,viki-org/VKVideoPlayer,weasleyqi/VKVideoPlayer,jingchunYuan/VKVideoPlayer,jinyouli/VKVideoPlayer,vikasd/VKVideoPlayer