fix incorrect GaussianBlur shader code generation

m_quickView in Qt5NodeInstanceServer::initializeView()
is instantiated with setProfile(QSurfaceFormat::CoreProfile)
However QGfxShaderBuilder::QGfxShaderBuilder() initiates and
generate the gaussian blur shader code with referring default format.
that doesn't set the profile to QSurfaceFormat::CoreProfile.

The correct resolution is to get profile with accessing current window.
But QGfxShaderBuilder is not QQuickItem so it doesn't have any way to
access current window.

As qmlscene does, it could be a nice solution to keep the current
surface format as default when instantiating QQuickView.

Fixes: QDS-1864
Change-Id: I0fcf80effccebf7cfe8e58c071cf121b6af5bdbd
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5nodeinstanceserver.cpp

@@ -67,6 +67,8 @@ void Qt5NodeInstanceServer::initializeView()
     QSurfaceFormat surfaceFormat = m_quickView->requestedFormat();
     surfaceFormat.setVersion(4, 1);
     surfaceFormat.setProfile(QSurfaceFormat::CoreProfile);
+    QSurfaceFormat::setDefaultFormat(surfaceFormat);
+
     m_quickView->setFormat(surfaceFormat);
 
     DesignerSupport::createOpenGLContext(m_quickView.data());