Restore original streams when terminating TLS

In theory we could return to communicate without TLS after a
shutdown. It also makes sure the connection object isn't left
completely without streams.
diff --git a/common/rfb/SSecurityTLS.h b/common/rfb/SSecurityTLS.h
index 6d32e3b..6f71182 100644
--- a/common/rfb/SSecurityTLS.h
+++ b/common/rfb/SSecurityTLS.h
@@ -65,6 +65,9 @@
 
     rdr::InStream* tlsis;
     rdr::OutStream* tlsos;
+
+    rdr::InStream* rawis;
+    rdr::OutStream* rawos;
   };
 
 }