Enable path mapping in PlaybackInfo endpoint

[shemanaev]

For some reason paths not mapped on that endpoint, but it will be nice to have for enabling native paths in jellyfin-mpv-shim.

Changes

Issues

[JustAMan]

Can you explain what this PR accomplishes?

[shemanaev]

Oh, sorry if it wasn't clear.
I am using "Shared network folder" options for my libraries for direct play.
/Users/yyy/Items/xxx?api_key=zzz endpoint correctly maps MediaSources[x].Path property to samba paths, but
/Items/xxx/PlaybackInfo?UserId=yyy&api_key=zzz doesn't.

Also latest version of Emby returns correct paths.

// /Users/yyy/Items/xxx?api_key=zzz
{
  ...
  "MediaSources": [
    {
      "Protocol": "File",
      "Id": "xxx",
      "Path": "\\\\media.local\\movies\\500 Days Of Summer (2009) Open Matte.mkv",
      ...
}

// /Items/xxx/PlaybackInfo?UserId=yyy&api_key=zzz
{
  "MediaSources": [
    {
      "Protocol": "File",
      "Id": "xxx",
      "Path": "/media/movies/500 Days Of Summer (2009) Open Matte.mkv"
      ...
    }
  ]
}

[JustAMan]

Let's be bold and break stuff, so we can fix it later! 😆