gtk3: fix wrong borders for linked primary toolbar buttons
gtk3: fix wrong borders for linked primary toolbar buttons

We now assume that if they're placed in a linked box, they also want the
link relationship to be visible, so remove some specificity by avoiding
restricting the theme to the raised class.

ChrisCummins/gnome-themes-standard,DoctorJellyface/gnome-themes-standard,rgcjonas/adwaita-semidark,Distrotech/gnome-themes-standard,rgcjonas/adwaita-semidark,rgcjonas/adwaita-semidark,rgcjonas/adwaita-semidark,Distrotech/gnome-themes-standard,ChrisCummins/gnome-themes-standard,DoctorJellyface/gnome-themes-standard,ChrisCummins/gnome-themes-standard,ChrisCummins/gnome-themes-standard,ChrisCummins/gnome-themes-standard