viaplay: use data-video-id instead of data-emediate-video_id.
viaplay: use data-video-id instead of data-emediate-video_id.

based on a fix by @magic75 and this fixes #108
selepo/svtplay-dl,spaam/svtplay-dl,selepo/svtplay-dl,OakNinja/svtplay-dl,olof/svtplay-dl,OakNinja/svtplay-dl,dalgr/svtplay-dl,iwconfig/svtplay-dl,olof/svtplay-dl,OakNinja/svtplay-dl,iwconfig/svtplay-dl,leakim/svtplay-dl,qnorsten/svtplay-dl,leakim/svtplay-dl,spaam/svtplay-dl,dalgr/svtplay-dl,leakim/svtplay-dl,qnorsten/svtplay-dl