util.output: make download video while using thumbnail and nfo work
util.output: make download video while using thumbnail and nfo work

When we download a video , nfo and thumbnail,
it will video will complain that the files already exists but its just the nfo and thumbnail.

fixes: #1148

spaam/svtplay-dl,olof/svtplay-dl,olof/svtplay-dl,spaam/svtplay-dl