Removed deprecated function calls

ObjectTypes/QtWidget/QtWidgetNode.cc

@@ -229,7 +229,7 @@ void QtWidgetNode::createTexture()
 {
   //grab texture from qt
   widget_->removeEventFilter(ef_);
-  QPixmap pix = QPixmap::grabWidget(widget_);
+  QPixmap pix = widget_->grab();
   widget_->installEventFilter(ef_);
 
   QImage image = pix.toImage();