limit open subtitle formats

MediaBrowser.Providers/Subtitles/OpenSubtitleDownloader.cs

@@ -321,7 +321,8 @@ namespace MediaBrowser.Providers.Subtitles
                         Name = i.SubFileName,
                         DateCreated = DateTime.Parse(i.SubAddDate, _usCulture),
                         IsHashMatch = i.MovieHash == hasCopy
-                    });
+
+                    }).Where(i => !string.Equals(i.Format, "sub", StringComparison.OrdinalIgnoreCase) && !string.Equals(i.Format, "idx", StringComparison.OrdinalIgnoreCase));
         }
 
         public void Dispose()