Fix for conversion rate on bounty email is wrong

[antonyip]

Description

This PR fixes the conversion issue that is found in #3999

Checklist

• Read and conforms to the contributor guidelines
• Read and conforms to the style guidelines
• Linter status: 100% pass
• Added relevant tests
• Tests pass and code coverage has not decreased
• Changes don't break existing behavior
• Commit message follows commit guidelines
• Code documentation
• Completed: Code review by core team and any requested changes

Affected core subsystem(s)

N/A

Refers/Fixes

Fixes: #3999

Testing and Sign-off

Small Change Done.

Contributor

• Read and followed the Contributor Guidelines
• Tested all changes locally
• Verified existing functionality
• Ran make test and everything passed!

Reviewer

• Affirm contributor guidelines have been followed and requested changes made
• CI tests and linting pass
• No conflicts (migrations, files, etc)
• Regression tested against staging or local deployment

Funder

• Validated requested changes were made to specification
• Bounty payout released to the contributor

[codecov]

Codecov Report

Merging #4003 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4003      +/-   ##
==========================================
- Coverage   30.01%   29.97%   -0.04%     
==========================================
  Files         205      205              
  Lines       16000    16000              
  Branches     2111     2111              
==========================================
- Hits         4802     4796       -6     
- Misses      11026    11032       +6     
  Partials      172      172

Impacted Files	Coverage Δ
app/dashboard/embed.py	28.16% <0%> (-3.45%)	⬇️

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[codecov]

Codecov Report

Merging #4003 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4003      +/-   ##
==========================================
- Coverage   30.01%   29.97%   -0.04%     
==========================================
  Files         205      205              
  Lines       16000    16000              
  Branches     2111     2111              
==========================================
- Hits         4802     4796       -6     
- Misses      11026    11032       +6     
  Partials      172      172

Impacted Files	Coverage Δ
app/dashboard/embed.py	28.16% <0%> (-3.45%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e8662ba...81f154b. Read the comment docs.