GtkButton: do not prelight in touchscreen mode
GtkButton: do not prelight in touchscreen mode

Code was copied from GtkToggleButton.

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>

https://bugzilla.gnome.org/show_bug.cgi?id=689138

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