Fix turnstile's UpdateTurnstileWidgetParams

[punkeel]

Description

We do not allow changing the region, so remove that.

There is a meaningful difference between setting a field to nil vs false: in one case, the previous value is kept. In the other, the false is used. With omitempty, go did the wrong thing–and prevented setting values to false (as they would NOT be sent over the wire).

Has your change been tested?

🤷

Types of changes

What sort of change does your code introduce/modify?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

I guess it's technically a breaking change to fix this. The alternative is to either always set all fields, but then UpdateTurnstileWidgetParams{domains: ...} would override EVERYTHING else, and that is a much worse breaking change.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• This change is using publicly documented in cloudflare/api-schemas
  and relies on stable APIs.

[punkeel]

changelog failed because:

go: downloading golang.org/x/exp/typeparams v0.0.0-20221212164502-fae10dda9338
go: golang.org/x/tools/cmd/goimports@latest (in golang.org/x/tools@v0.27.0): go.mod:3: invalid go version '1.22.0': must match format 1.23
internal/tools/tools.go:22: running "go": exit status 1

don't see how that's related to my PR

[github-actions]

This functionality has been released in v0.110.0.

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