Fixed: Use both album artist and track artist fields to pick up author for audiobooks

src/NzbDrone.Core/MediaFiles/AudioTag.cs

@@ -76,7 +76,8 @@ public void Read(string path)
                 {
                     authors.AddRange(tag.AlbumArtistsSort);
                 }
-                else if (tag.Performers?.Any() ?? false)
+
+                if (tag.Performers?.Any() ?? false)
                 {
                     authors.AddRange(tag.Performers);
                 }