scd: Fix varargs call for 64-bit arch on ECC keys.
* scd/app-openpgp.c (store_fpr): Remove CARD_VERSION from the arguments. (rsa_writekey): Follow the change. (do_genkey): Likewise. (ecc_writekey): Likewise. Cast to size_t.
KEYTOCARD caused SEGV of scdaemon on 64-bit arch. That's because
int is 32-bit, but size_t is 64-bit.