Fix FormattingStreamWriter type

Signed-off-by: gnattu <gnattuoc@me.com>

MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs

@@ -1206,7 +1206,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
 
             // Generate concat configuration entries for each file and write to file
             Directory.CreateDirectory(Path.GetDirectoryName(concatFilePath));
-            using StreamWriter sw = new FormattingStreamWriter(concatFilePath, CultureInfo.InvariantCulture);
+            using var sw = new FormattingStreamWriter(concatFilePath, CultureInfo.InvariantCulture);
             foreach (var path in files)
             {
                 var mediaInfoResult = GetMediaInfo(