Replaced var keyword with let/const, this fixes #11473

[Josephsanya]

Fixes #11473

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Code Climate has analyzed commit 9c39532 and detected 0 issues on this pull request.

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[github-actions]

This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/8758903858/artifacts/397001819

[PeculiarE]

Looks good @Josephsanya....great job!

@TildaDares...I believe this is ready to be merged. Thank you!

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[TildaDares]

Congratulations on merging your PR @Josephsanya 🎉

[TildaDares]

Thank you for the review @PeculiarE❤️