Update FWB download link

[niqjohnson]

Minor update to a link on the financial well-being survey about page. See GHE//Design-Development/cfgov/issues/4731 for details.

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Changes

• Update link on FWB survey about page

Checklist

• PR has an informative and human-readable title
  • PR titles are used to generate the change log in releases; good ones make that easier to scan.
  • Consider prefixing, e.g., "Mega Menu: fix layout bug", or "Docs: Update Docker installation instructions".
• Changes are limited to a single goal (no scope creep)
• Code follows the standards laid out in the CFPB development guidelines