scd: change default value of pinpad maxlen.
* scd/apdu.c (pcsc_pinpad_verify, pcsc_pinpad_modify): Default value of maxlen for pinpad input is now 15 (was: 25). * scd/ccid-driver.c (ccid_transceive_secure): Likewise.
For newer PC/SC, it is better to use FEATURE_GET_TLV_PROPERTIES to get
bMaxPINSize.