Prevent sample files showing up in the TV shows area of Media Library

[SubJunk]

No description provided.

[SurfaceS]

I think this one should not be merged now.

My next PR will remove video track info from FILES table, and move it to VIDEOTRACKS table.

Also, filtering on a "greater than double value" is maybe not the best way to do.

Sample can be a flag on VIDEO_METADATA table, like the ISTVEPISODE one (ISSAMPLE, or ISTRAILER).

[SubJunk]

@SurfaceS cool, I agree. It is potentially still a good index to add here https://github.com/UniversalMediaServer/UniversalMediaServer/pull/3978/files#diff-552ef7c3f32721c1801d78dd004a1f15a637b21e22215c79192b3b8ed552bffeR467 because we already filter by duration for movies. Or we could add an isMovie boolean and start using that