Fix storybook screenshot diff action

[Nateowami]

This is an attempt to fix screenshot diffs showing up on the wrong PR.

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.04%. Comparing base (88411e7) to head (0ff31f7).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3862   +/-   ##
=======================================
  Coverage   81.04%   81.04%           
=======================================
  Files         630      630           
  Lines       40594    40594           
  Branches     6588     6588           
=======================================
  Hits        32900    32900           
+ Misses       6674     6661   -13     
- Partials     1020     1033   +13     

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[marksvc]

@marksvc reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on Nateowami).