ContrastHigh, GTK3-3.14: adjust to GTK3-3.13 changes
https://git.gnome.org/browse/gtk+/commit/?id=4e077d4638b4ecfaf67afbab5082b9d47499af4f
https://bugzilla.redhat.com/show_bug.cgi?id=1136994
- GtkCheckButton
- GtkRadioButton