QmlDesigner.NodeInstances: Fix timeout for tests

Change-Id: If024515cf43668569b625719f77cc30545453c59
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/designercore/instances/nodeinstanceserverproxy.cpp

@@ -320,7 +320,7 @@ void NodeInstanceServerProxy::writeCommand(const QVariant &command)
         writeCommandToSocket(QVariant::fromValue(synchronizeCommand), m_firstSocket.data(), m_writeCommandCounter);
         m_writeCommandCounter++;
 
-        while(m_firstSocket->waitForReadyRead()) {
+        while (m_firstSocket->waitForReadyRead(100)) {
                 readFirstDataStream();
                 if (m_synchronizeId == synchronizeId)
                     return;