Add debug logging when formatting audio channels

src/NzbDrone.Core/MediaFiles/MediaInfo/MediaInfoFormatter.cs

@@ -26,15 +26,21 @@ namespace NzbDrone.Core.MediaFiles.MediaInfo
                 {
                     if (mediaInfo.SchemaRevision >= 3)
                     {
+                        Logger.Debug("Formatiting audio channels using 'AudioChannels', with a value of: '{0}'", audioChannels);
+
                         return audioChannels;
                     }
 
                     return 0;
                 }
 
+                Logger.Debug("Formatiting audio channels using 'AudioChannelPositionsText', with a value of: '{0}'", audioChannelPositionsText);
+
                 return mediaInfo.AudioChannelPositionsText.ContainsIgnoreCase("LFE") ? audioChannels - 1 + 0.1m : audioChannels;
             }
 
+            Logger.Debug("Formatiting audio channels using 'AudioChannelPositions', with a value of: '{0}'", audioChannelPositions);
+
             if (audioChannelPositions.Contains("+"))
             {
                 return audioChannelPositions.Split('+')