Harmattan: app using NoMStyle, text too small

Reproduce:

• Create simple app using Qt Quick Application template
• Run it on device, text size ok

Modify the main.cpp like this:

QApplication app(argc, argv);
app.setProperty("NoMStyle", QVariant(true)); // <==

This disables the plain Qt style, which is useful to cut some bloat (unneeded for QML apps)

• Note how the text size is way too small

While this clearly happens because default font is provided by the plain Qt style, some workaround should be added to have a sensible size for apps not willing to use the Maemo6 plain Qt style .