Move reverse connection information into VNCSConnectionST

The only class that cares if connections are reversed or not is
VNCSConnectionST so let it keep track of this fact.
diff --git a/common/rfb/SConnection.cxx b/common/rfb/SConnection.cxx
index 99a4850..9bff4cd 100644
--- a/common/rfb/SConnection.cxx
+++ b/common/rfb/SConnection.cxx
@@ -48,11 +48,10 @@
 const SConnection::AccessRights SConnection::AccessFull           = 0xffff;
 
 
-SConnection::SConnection(bool reverseConnection_)
+SConnection::SConnection()
   : readyForSetColourMapEntries(false),
     is(0), os(0), reader_(0), writer_(0),
     security(0), ssecurity(0), state_(RFBSTATE_UNINITIALISED),
-    reverseConnection(reverseConnection_),
     preferredEncoding(encodingRaw)
 {
   defaultMajorVersion = 3;