QmlDesigner: Remove code which does nothing

Change-Id: Ia6edcd10c42f0ef71ed1237e45185e5fd8a4a66e
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/graphicalnodeinstance.cpp

@@ -143,8 +143,6 @@ QImage GraphicalNodeInstance::renderImage() const
 
     QImage renderImage = designerSupport()->renderImageForItem(quickItem(), renderBoundingRect, renderBoundingRect.size().toSize());
 
-    renderImage = renderImage.convertToFormat(QImage::Format_ARGB32_Premultiplied);
-
     return renderImage;
 }
 

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5previewnodeinstanceserver.cpp

@@ -107,8 +107,6 @@ QImage Qt5PreviewNodeInstanceServer::renderPreviewImage()
 
     QImage previewImage = rootNodeInstance().renderPreviewImage(previewImageSize);
 
-    previewImage = previewImage.convertToFormat(QImage::Format_ARGB32_Premultiplied);
-
     return previewImage;
 }