Move indeterminate setting into listening stream.

src/com/dmdirc/util/io/Downloader.java

      */
     public void downloadPage(final String url, final Path file, final DownloadListener listener)
             throws IOException {
-        if (listener != null) {
-            listener.setIndeterminate(true);
-        }
         final URLConnection connection = getConnection(url, "");
         Files.copy(new ListenerInputStream(connection.getInputStream(), listener,
                         connection.getContentLength()), file);

src/com/dmdirc/util/io/ListenerInputStream.java

         this.length = length;
         count = 0;
         mark = count;
+        if (length == -1) {
+            listener.setIndeterminate(true);
+        }
     }
 
     @Override