Print dialog: small keynav improvement
Print dialog: small keynav improvement

Mark the page range entry and the copies spin button as
activates-default.

https://bugzilla.gnome.org/show_bug.cgi?id=662670

johne53/MB3Gtk-2,Distrotech/gtk,Distrotech/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,Unity-Technologies/gtk,Unity-Technologies/gtk,johne53/MB3Gtk-2,Unity-Technologies/gtk,Distrotech/gtk,Unity-Technologies/gtk,Distrotech/gtk,johne53/MB3Gtk-2,Distrotech/gtk,Unity-Technologies/gtk