Add tests to check the rendering of the profile info panel

The existing coverage about the profile info panel has been lost in a recent PR.
We should have new tests covering this more explicitely.

Here is how this could be done.

1. this could be a new file in `src/test/components/MetaInfo.test.js`
1. it could be something like this (I didn't try it, so you'll likely have to correct it):

```js
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// @flow
import * as React from 'react';
import { render } from 'react-testing-library';

import { getEmptyProfile } from '../../profile-logic/data-structures';

describe('app/MenuButtons/MetaInfo', () => {
function setup() {
const profile = getEmptyProfile();
// change things in profile.meta, so that they show up correctly in the panel

const results = render(

);
return results;
}

it('matches the snapshot to display information for a profile', () => {
const { container } = setup();
expect(container.firstChild).toMatchSnapshot();
});
});
```

Probably we need to mock the date objects by using https://www.npmjs.com/package/jest-date-mock to be able to handle the timezone differences.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-203)