Added missing 'required' attribute

[danrparker]

Description

This won't fix the issue, as it is related to saving each individual field before submitting, but it is needed.

Checklist

• [x] I accept the contributor license agreement for this repository.
• [x] All active GitHub checks for tests, formatting, and security are passing.
• [x] The correct base branch is being used (if not main).
• [x] A GitHub issue or linear task is linked to this pull request.

[linear[bot]]

WEB-409 Elections nominate submitting with empty fields

[cloudflare-workers-and-pages[bot]]

Deploying website-storybook with    Cloudflare Pages

Latest commit:	fece5f6
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