winrt: Properly deinitialize socket on connection failure

Change-Id: I4dde73423111ca4af386fa76ac26d1a1161fe493
Reviewed-by: Andre de la Rocha <andre.rocha@qt.io>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>

src/network/socket/qnativesocketengine_winrt.cpp

@@ -1346,6 +1346,7 @@ void QNativeSocketEngine::handleConnectOpFinished(bool success, QAbstractSocket:
     if (!success) {
         d->setError(error, errorString);
         d->socketState = QAbstractSocket::UnconnectedState;
+        close();
         return;
     }