[simple-scan] Make about dialog app name translatable

[Robert Ancell <rancell src gnome org>]

commit aed1f8d006bd4b1b92f0bc1af8f338e404133ddb
Author: Robert Ancell <robert ancell canonical com>
Date:   Fri Sep 28 11:39:21 2018 +1200

    Make about dialog app name translatable

 src/app-window.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/app-window.vala b/src/app-window.vala
index d673725..a62a5e1 100644
--- a/src/app-window.vala
+++ b/src/app-window.vala
@@ -1263,7 +1263,7 @@ public class AppWindow : Gtk.ApplicationWindow
 
         Gtk.show_about_dialog (this,
                                "title", title,
-                               "program-name", "Simple Scan",
+                               "program-name", _("Simple Scan"),
                                "version", VERSION,
                                "comments", description,
                                "logo-icon-name", "scanner",