gpg: Simplify status message code from commit b30c15bf.
* g10/keygen.c (card_write_key_to_backup_file): Simplify by using hexfingerprint.
Note that the extra blank added to FPRBUF in the old code was not
needed because write_status_text_and_buffer already ensures that
there will be a space.
- Signed-off-by: Werner Koch <wk@gnupg.org>