fix invalid check and restore workaround from #72

[savely-krasovsky]

It seems this check was not valid for a while. This PR fixes that and restores unsealing for the old devices.

[google-cla]

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[savely-krasovsky]

@jkl73 please review! I have found this bug after our discussion from #72.

[jkl73]

Also just out of my curiosity, do you the actual model and manufacturer of the TPM you facing the issue with? (is it a firmware TPM or a standalone TPM)

[savely-krasovsky]

@jkl73 this is ST Microelectronics (STM).
Manufacturer version: 73.4.17568.4452
Spec version: 2.0
PPI spec version: 1.3
Subversion of TPM spec: 1.16 (9.21.2016)
Spec version of client computer: 1.00

Sorry, I could translate something wrong, user gave me only a screenshot of Windows Defender window in Russian:

Screenshot

[jkl73]

Thanks for fixing this!