trezor: Return PASSPHRASE_ON_DEVICE if passphrase entry on device is available #495
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Somewhere between firmware versions 2.3.0 and 2.3.6, the Trezor T started using a slightly different message which results in our passphrase handling incorrectly giving the passphrase from the host instead of forcing passphrase entry on device. We fix this issue by returning the correct object to indicate that passphrase entry should occur on device.