raitv: Remove slow keys
raitv: Remove slow keys

URL isn't a slow key, the URL of the video is available directly
in the browse XML along with the thumbnail, title, etc.

https://bugzilla.gnome.org/show_bug.cgi?id=722822

vrutkovs/grilo-plugins,vrutkovs/grilo-plugins,MathieuDuponchelle/grilo-plugins,jasuarez/grilo-plugins,jasuarez/grilo-plugins,MathieuDuponchelle/grilo-plugins,grilofw/grilo-plugins,MikePetullo/grilo-plugins,MikePetullo/grilo-plugins,vrutkovs/grilo-plugins,vrutkovs/grilo-plugins,GNOME/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins,MathieuDuponchelle/grilo-plugins,GNOME/grilo-plugins,grilofw/grilo-plugins