[FunnyOrDie] fix thumbnails + add test (fixes #2856)
This should make the format list output look a bit nicer.
Improve download mechanism when Range HTTP header is ignored
For example for georestricted videos.
It's already unquoted after calling 'compat_parse_qs'. It replaced '+' with spaces, for example in https://www.youtube.com/watch?v=XC0b5YexO-I.