Change nameless functions to arrow functions

[jssol]

Fixes #1235

Made sure these boxes are checked before the pull request (PR) is ready to be reviewed and merged.

• PR is descriptively titled 📑 and links the original issue above 🔗
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• code is in a uniquely-named feature branch and has no merge conflicts 📁
• @Achele, @TildaDares I have implemented the fix, and I would like to get a review.

Requirements

• Refactored nameless functions in DistortableCollectionEditSpec.js to arrow functions.

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[TildaDares]

Amazing work @jssol. Thank you!

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[TildaDares]

Congratulations on merging your PR @jssol 🎉🎉

[jssol]

Thanks for the review @TildaDares, I'm heading to the next steps 🚀