Also, this got broken after the Kirigami to verion 2.2 in main.qml. So, set the header background color according to our theme setting. Notice, that there is a remaining issue here. We could color the text color in the header, but now, this seems impossible (or I do not understand how and where to set this). Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>