g10: Don't limit at the frontend side for card capability.

* g10/card-util.c (MAX_GET_DATA_FROM_FILE): New.
(get_data_from_file): Use MAX_GET_DATA_FROM_FILE.
(change_url, change_login, change_private_do): Don't limit.

V3.3 card support longer data for URL, Login and Private DOs.
It's scdaemon which knows that.

• Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>