fix(accessibility): Fix user settings email description

[eatyourgreens]

Fixes an empty description for the email address text input in the new verified email code.

• Fixes #7119.

Required Manual Testing

• [ ] Does the non-logged in home page render correctly?
• [ ] Does the logged in home page render correctly?
• [ ] Does the projects page render correctly?
• [ ] Can you load project home pages?
• [ ] Can you load the classification page?
• [ ] Can you submit a classification?
• [ ] Does talk load correctly?
• [ ] Can you post a talk comment?

Review Checklist

• [ ] Does it work in all major browsers: Firefox, Chrome, Edge, Safari?
• [ ] Does it work on mobile?
• [ ] Can you npm ci and app works as expected?
• [ ] If the component is in coffeescript, is it converted to ES6? Is it free of eslint errors? Is the conversion its own commit?
• [ ] Are the tests passing locally and on GitHub Actions?

Optional

• [ ] Have you replaced any ChangeListener or PromiseRenderer components with code that updates component state?
• [ ] If changes are made to the classifier, does the dev classifier still work?
• [ ] Have you resized and compressed any image you've added?
• [ ] Have you added in flow type annotations?
• [ ] Have you followed the Springer guidelines for commit messages?

[coveralls]

coverage: 56.991%. remained the same when pulling fd314305729a4e4530ca850f6181412745c1401d on eatyourgreens:patch-1 into e73d2093e65f3abe1d6fcc9701699b0237751b7e on zooniverse:master.

[eatyourgreens]

In the input description, a Unicode check mark or tick would be better than the private use character \uf058. This is why icon fonts are generally not accessible. The Unicode character bears no relation to the displayed symbol.

[eatyourgreens]

Pinging @shaunanoordin to take a look at this.