Manjaro Plasma on the Microsoft Surface Go 2: fix description to remove GTK titlebar buttons

KDE GTK Configurator adjusts the GTK theme according to the Plasma settings to ensure a common look and feel. Therefore, the gsettings configuration and ~/.config/gtk-3.0/settings.ini are overwritten on login. The titlebar buttons were not visible for KDE applications because the complete titlebar was disabled. However, the buttons were technically still there and thus shown in GTK apps which draw the titlebar buttons in the application window (not in the titlebar).