Since we are already applying the changing in the PpDetailsDialog
when it gets closed, there's no need to apply these changes in
the focus-out-event of its respective GtkEntries.
https://bugzilla.gnome.org/show_bug.cgi?id=769114
This dialog handles the editing of printer properties such as
name, location, automatic discovery of driver, manual selection
of printer driver, and manual selection of ppd file.
https://bugzilla.gnome.org/show_bug.cgi?id=767600