Do not crash on delete_event in new user dialog. Fix #401484.

If the new user dialog is closed with the help of the window manager,
the delete_event is not handled and g_assert_not_reached() is reached by
the code. Treat it like a click on "Cancel" instead.

BP


git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@15459 57a11ea4-9604-0410-9ed3-97b8803252fd

src/gnome/dialog-new-user.c

@@ -99,6 +99,7 @@ gnc_ui_new_user_dialog (void)
   result = gtk_dialog_run (GTK_DIALOG (dialog));
   switch (result) {
 	  case GTK_RESPONSE_CANCEL:
+	  case GTK_RESPONSE_DELETE_EVENT:
 		gnc_ui_new_user_cancel_dialog ();
 		break;
 	  case GTK_RESPONSE_OK: