To make it work `encryption-public-key` and `whisper-private-key` are
stored on the devices when a user chooses this option. The former key is
used for multiaccount's database encryption, the latter is needed for a
messaging. In case if a user wants to sign a transaction the card is
still needed, we don't store wallet's keys on the device.
Other things were fixed/added:
- A user can enable biometric auth for a regular account when chooses
to save the password on the device (if biometric auth is available).
This is done for feature parity between keycard and "on device"
accounts.
- The option to create/restore an account on a keycard is not shown on
the devices which do not support NFC. Currently, the app just crashes
if the user continues a flow which is not supported by the device.
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