fix/278: add id to the default row

[Sidsector9]

Description of the Change

The reordering was broken due to the empty id parameter for the default row. This PR fixes it.

Closes #278

How to test the Change

Please follow the steps provided in the issue.

Changelog Entry

Fixed - Broken Repeater component drag and drop reordering functionality

Credits

Props @ajmaurya99 @Sidsector9

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[github-actions]

Size Change: +20 B (0%)

Total Size: 65.3 kB

Filename	Size	Change
dist/index.js	65.3 kB	+20 B (0%)

_{compressed-size-action}

[github-actions]

🎉 A new testing version of this package has been published to NPM. You can install it with npm install @10up/block-components@testing-281

[tlovett1]

@Sidsector9 this introduced a new bug. The first element of that array does not exists since it's using default.

[Sidsector9]

@tlovett1 can you provide the steps to reproduce this issue? When you say the first element does not exist, does it mean in the DB?
I created 3 items, verified with the data stored in the block attributes in the DB.