scd: Fix bBWI value.
* scd/ccid-driver.c (ccid_transceive_apdu_level): Use bBWI=0 for APDU level transfer. (ccid_transceive): Use bBWI=0 or the value returend by WTX for TPDU level transfer.
- GnuPG-bug-id: T4654
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>