Fix token based activation with specific keyslot selected

Ondrej Kozinarequested to merge
oniko1/cryptsetup:token-activation-fixes-cli into main

This also allows to check specific token is capable to unlock specific keyslot id:

Can token 0 unlock keyslot 5?: cryptsetup open --test-passphrase --token-id 0 --key-slot 5 --token-only /dev/device

Can any token unlock keyslot 5?: cryptsetup open --test-passphrase --key-slot 5 --token-only /dev/device

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