Homepage Posts Block: decode entities in categories when shown

[laurelfulford]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

When you have a category with an ampersand, it appears encoded in the editor (& rather than &). This PR wraps the category output in decodeEntities() to fix.

How to test the changes in this Pull Request:

1. Add a category with an ampersand, and apply it to a post; publish.
2. Add the Homepage Posts block to a page, and make sure your new post is displaying in it.
3. Note the ampersand in the editor:

4. Apply the PR and run npm run build.
5. Confirm that the ampersand is now displaying as expected:

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[laurelfulford]

Thanks!

[matticbot]

🎉 This PR is included in version 1.6.0 🎉

The release is available on GitHub release

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