fix: animated background gradient broken by #256

[chrisvogt]

In #256 I refactored how circles are created in animated-background.js, but forgot to update all instances of a method to use the new changes. This PR fixes that.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.07%. Comparing base (7904d72) to head (aec59d3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #258      +/-   ##
==========================================
+ Coverage   90.92%   91.07%   +0.15%     
==========================================
  Files          67       67              
  Lines         650      650              
  Branches      182      182              
==========================================
+ Hits          591      592       +1     
+ Misses         52       51       -1     
  Partials        7        7              

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[chrisvogt]

Things are looking good in the deploy preview link. I'm going to merge this. 🚀