Fix scdaemon pinentry inquire cancelation.
Similar to commit 29af488 but also fixes PKDECRYPT and PKSIGN.
- agent/call-scd.c (agent_card_pkdecrypt): Check for GPG_ERR_CANCELED
when returning from the PKDECRYPT operation of scdaemon and cancel the
inquire.
(agent_card_pksign): Ditto.
(cancel_inquire): New.