fix fdo#33473: bin duff 'togglebutton' detail hurting Ambience theme.
fix fdo#33473: bin duff 'togglebutton' detail hurting Ambience theme.

cf. https://webstats.gnome.org/GTK%2B/ThemingInternals
(GtkToggleButton is a subclass of GtkButton)

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core