x/crypto/openpgp: Fixed failure to encrypt data using deserialized Entity

[Geo25rey]

Fixes #42310

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This PR is being closed because golang.org/cl/267077 has been abandoned.

The x/crypto/openpgp package is now frozen, so it won't accept any more non-security changes. Thank you for opening a PR and sorry for the significant lag. You might want to consider submitting this change to one of the community forks of this package instead. See https://golang.org/issues/44226 for more information about this decision.