fuzz: Use new option name

Author: rtpt-alexanderneumann

cmd/fuzz/main.go

@@ -327,7 +327,7 @@ func startRunners(ctx context.Context, opts *Options, in <-chan string) (<-chan
 
 	for i := 0; i < opts.Threads; i++ {
 		runner := response.NewRunner(transport, opts.Request, in, out)
-		runner.BodyBufferSize = opts.MaxBodySize * 1024 * 1024
+		runner.MaxBodySize = opts.MaxBodySize * 1024 * 1024
 		runner.Extract = opts.extract
 
 		runner.Client.CheckRedirect = func(req *http.Request, via []*http.Request) error {