Fix violin plot in Plotly

[hoxbro]

Fixes #6236

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.19%. Comparing base (6f042b3) to head (17ea87f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6237   +/-   ##
=======================================
  Coverage   88.19%   88.19%           
=======================================
  Files         321      321           
  Lines       67344    67346    +2     
=======================================
+ Hits        59391    59393    +2     
  Misses       7953     7953           

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