kbx: Include deleted records into the --stats output.

* kbx/keybox-dump.c (_keybox_dump_file): Take deleted records in
account.

This also changes the numbering of the records to reflect the real
record number.

(cherry picked from commit 5ef0d7a795cf2462314ea0cb72c7efa7243ab405)

• Signed-off-by: Werner Koch <wk@gnupg.org>