scd: Don't send GET_STATUS packet if not needed.
* scd/apdu.c (apdu_get_status_internal): Add ON_WIRE arg. (apdu_connect): Call apdu_get_status_internal with ON_WIRE enabled. (apdu_get_status): For periodical check, call apdu_get_status_internal with ON_WIRE disabled.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>