api: Default to HTTPS protocol for frontend links

[victorges]

What does this pull request do? Explain your changes. (required)

We were creating http URLs that break on Brave. Don't know when x-forwarded-proto
stopped being set but I think the default should be HTTP anyway.

Specific updates (required)
http->https

How did you test each of these updates (required)
Create an account and make sure email verification is HTTPS

Does this pull request close any open issues?
DX-184

Checklist

• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.

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Name	Status	Preview	Updated (UTC)
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[codecov]

Codecov Report

Merging #1708 (6482f8c) into master (8b49763) will not change coverage.
The diff coverage is 100.00000%.

@@              Coverage Diff              @@
##              master       #1708   +/-   ##
=============================================
  Coverage   52.78002%   52.78002%           
=============================================
  Files             75          75           
  Lines           4964        4964           
  Branches         988         988           
=============================================
  Hits            2620        2620           
  Misses          2007        2007           
  Partials         337         337           

Impacted Files	Coverage Δ
packages/api/src/controllers/user.ts	42.60355% <100.00000%> (ø)

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Impacted Files	Coverage Δ
packages/api/src/controllers/user.ts	42.60355% <100.00000%> (ø)

[adamsoffer]

LGTM