Fix for [HER-1681] FetchFTP module doesn't set content-begin mark correctly.

Bug reported and fix suggested by Tomas Ukkonen.
* FetchFTP.java
    saveToRecorder(): call recorder.markContentBegin() after recorder.outputWrap()

modules/src/main/java/org/archive/modules/fetcher/FetchFTP.java

@@ -325,9 +325,9 @@ public class FetchFTP extends Processor  {
     private void saveToRecorder(ProcessorURI curi,
             Socket socket, Recorder recorder) 
     throws IOException, InterruptedException {
-        recorder.markContentBegin();
         recorder.inputWrap(socket.getInputStream());
         recorder.outputWrap(socket.getOutputStream());
+        recorder.markContentBegin();
 
         // Read the remote file/dir listing in its entirety.
         long softMax = 0;