[PATCH gnupg] scd: Add Nitrokey 3 to pcsc-shared interference detection

[Artemii Bigdan]

Hi,

this patch extends the pcsc-shared interference detection introduced
in commit rG044e5a3c3801 (T5484) to also cover Nitrokey 3 tokens.

The detection was limited to CARDTYPE_YUBIKEY. This patch adds
CARDTYPE_NK3 alongside Yubikey in all relevant code paths.

Additionally, the ATR-based card type heuristics in app_new_register()
is moved to run unconditionally. NK3 does not support SELECT MF (0x3F00)
in all states, which previously routed it through the Yubikey detection
path, skipping ATR detection and leaving the cardtype as GENERIC.

The patch is attached.

GnuPG-bug-id: T5484
Signed-off-by: Artemii Bigdan <artem at bigdan.in>
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