Composite data writers weren't passing down the HeaderType info.

Change-Id: Icbbe361e127a0cd62cdcd2f5321412fb230981f9

IO/XML/vtkXMLCompositeDataWriter.cxx

@@ -492,6 +492,7 @@ void vtkXMLCompositeDataWriter::CreateWriters(vtkCompositeDataSet* hdInput)
         w->SetBlockSize(this->GetBlockSize());
         w->SetDataMode(this->GetDataMode());
         w->SetEncodeAppendedData(this->GetEncodeAppendedData());
+        w->SetHeaderType(this->GetHeaderType());
         }
 
       // If this is a parallel writer, set the piece information.