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/CSecurityTLS.h b/common/rfb/CSecurityTLS.h
index 0d5f899..4932c07 100644
--- a/common/rfb/CSecurityTLS.h
+++ b/common/rfb/CSecurityTLS.h
@@ -72,6 +72,9 @@
 
     rdr::InStream* tlsis;
     rdr::OutStream* tlsos;
+
+    rdr::InStream* rawis;
+    rdr::OutStream* rawos;
   };
 }