PostComputeProvider.id starts from 1

[zhiqiangxu]

Here is the evidence.

[fasmat]

Thanks for your contribution @zhiqiangxu 🙂

We are currently not using the gpu-post in the go-spacemesh node. The project has been put on hold in favour of https://github.com/spacemeshos/post-rs.

It is yet undecided if we will use gpu-post again. But if we do, we'll incorporate your fixes.

[zhiqiangxu]

@fasmat Thanks for telling!