Fix: newsletter detail subscribe fix

[angel-tnc]

Why

While testing secrets rotation, we realized the newsletter subscription block does not work in the newsletter article pages.

What

Added the missing site parameter the NewsletterBlock component.

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Name	Status	Preview	Comments	Updated
staging-tiny-news-sites	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 31, 2023 at 5:22PM (UTC)

2 Ignored Deployments

| Name | Status | Preview | Comments | Updated | | :--- | :----- | :------ | :------- | :------ | | **tiny-news-curriculum** | ⬜️ Ignored ([Inspect](https://vercel.com/news-catalyst/tiny-news-curriculum/7CxNQcxA88KkpKvCFL14eWcDGpMQ)) | | | Mar 31, 2023 at 5:22PM (UTC) | | **tiny-news-sites** | ⬜️ Ignored ([Inspect](https://vercel.com/news-catalyst/tiny-news-sites/GhSuqwN3uWXm87HJZYjndWdZXYn1)) | | | Mar 31, 2023 at 5:22PM (UTC) |

[chelsea-tnc]

Good catch! Trying to get a better idea of the repro, here are the steps I tried:

1. Go to a single newsletter page such as https://harveyworld.org/newsletters/the-2023-harvey-municipal-election/12632
2. Scroll down to the very bottom and input name and email. Click submit. Is this the error fixed by this change?

[angel-tnc]

Yep, the fix is for that "JSON input" error.