scd: Release the card reader after card removal.
* scd/command.c (update_reader_status_file): Call apdu_close_reader.
Backport of master commit: 8fe81055762d9c9e6f03fb7853a985c94ef73ac3
- GnuPG-bug-id: T2651
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>