Fixed a stupid scoping mistake in GtkDefs.pm.
Fixed a stupid scoping mistake in GtkDefs.pm.

johne53/MB3Glibmm,GNOME/glibmm,johne53/MB3Glibmm,GNOME/glibmm,johne53/MB3Glibmm,GNOME/glibmm,johne53/MB3Glibmm,GNOME/glibmm,GNOME/glibmm