Does not observe transcodedContentType field when track will be transcoded to a different format

[Simon J]

When ND determines that transcoding is required it will return additional fields from getSong
ie

      "contentType": "audio/mp4",
      "suffix": "m4a",
      "transcodedContentType": "audio/ogg",
      "transcodedSuffix": "opus",

Bonob currently totally ignores these which may be the cause of sonos not playing tracks like this.