Change search script include from HTTP to HTTPS

[chosak]

This PR changes a script include from HTTP to HTTPS.

See also cfgov-refresh#2474.

Changes

• Changed references from http://search.usa.gov to https://search.usa.gov.

  Testing

• When running this app as part of the larger cfgov-refresh project, browse to the Paying for College section and note the lack of mixed-content warnings in the browser dev console.

  Review

• @higs4281 @cfpb/cfgov-frontends

  Checklist

• [X] Changes are limited to a single goal (no scope creep)
• [X] Code can be automatically merged (no conflicts)
• [ ] Code follows the standards laid out in the front end playbook
• [ ] Passes all existing automated tests
• [ ] New functions include new tests
• [ ] New functions are documented (with a description, list of inputs, and expected output)
• [ ] Placeholder code is flagged
• [ ] Visually tested in supported browsers and devices
• [ ] Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)

[coveralls]

Coverage remained the same at 100.0% when pulling fb90d3b25ae9d7886ecd69baed41206783221acc on http-to-https into a56555de222a40ec70c7f8a81a8bc137a73fce89 on master.

[higs4281]

👍