gnome3: Use the program name as default title.
* gnome3/pinentry-gnome3.c (create_prompt): If no title is requested, use the program name as the default title. This mimics what the GTK+2 variant does (although the GTK+2 pinentry seems to use basename(argv[0])).
- GnuPG-bug-id: T2920
- Signed-off-by: Justus Winter <justus@g10code.com>