[Refresh] Thunderbird link in nav is missing utm_params

[alexgibson]

Description

The Thunderbird link in the products section of the new navigation is missing UTM parameters, unlike the other external links.

Looks like it is coded with:

https://www.thunderbird.net/{{ referrals }}

Instead of:

https://www.thunderbird.net/{{ utm_params }}

Steps to reproduce

https://www.mozilla.org/en-US/

Expected result

The link should contain the following UTM params ?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=products.

Actual result

The link has no UTM params.

Environment

Firefox Nightly
macOS