Minor cleanup plotlyjs

[fonsp]

Adding a var to avoid "sloppy mode" JS.

[codecov]

Codecov Report

Merging #3510 (622fe1d) into master (4069b73) will not change coverage.
The diff coverage is n/a.

❗ Current head 622fe1d differs from pull request most recent head 10e2401. Consider uploading reports for the commit 10e2401 to get more accurate results

@@           Coverage Diff           @@
##           master    #3510   +/-   ##
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  Coverage   64.05%   64.05%           
=======================================
  Files          27       27           
  Lines        6611     6611           
=======================================
  Hits         4235     4235           
  Misses       2376     2376           

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[BeastyBlacksmith]

Thanks! Would you mind also updating your information in #3503 (.zenodo.json)?