Remove transport=tls in registrar URI

RFC3261 deprecated this attribute:
    [...] The use of "transport=tls" has consequently been
    deprecated, partly because it was specific to a single hop
    of the request. [...]

Closes #2

src/net/java/sip/communicator/impl/protocol/sip/SipRegistrarConnection.java

@@ -1288,8 +1288,11 @@ public SipURI getRegistrarURI()
             if(registrarPort != ListeningPoint.PORT_5060)
                 registrarURI.setPort(registrarPort);
 
-            if(!registrationTransport.equals(ListeningPoint.UDP))
+            if(!registrationTransport.equals(ListeningPoint.UDP)
+                && !registrationTransport.equals(ListeningPoint.TLS))
+            {
                 registrarURI.setTransportParam(registrationTransport);
+            }
         }
         return registrarURI;
     }