Remove duplicate code and use using to properly dispose the response stream

Emby.Server.Implementations/HttpClientManager/HttpClientManager.cs

@@ -539,22 +539,11 @@ namespace Emby.Server.Implementations.HttpClientManager
 
                     var contentLength = GetContentLength(httpResponse);
 
-                    if (contentLength.HasValue)
-                    {
-                        using (var fs = _fileSystem.GetFileStream(tempFile, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read, true))
-                        {
-                            await httpResponse.GetResponseStream().CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
-                        }
-                    }
-                    else
-                    {
-                        // We're not able to track progress
                     using (var stream = httpResponse.GetResponseStream())
                     using (var fs = _fileSystem.GetFileStream(tempFile, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read, true))
                     {
                         await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
                     }
-                    }
 
                     options.Progress.Report(100);