Removed logical NOT operator where unnecessary and modified code

[Josephsanya]

This fixes #1251

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[gitpod-io]

[jywarren]

Hi @Josephsanya this looks really good, thank you!

[TildaDares]

Hi @Josephsanya, the build is failing. Please take a look at the logs and fix the errors. https://github.com/publiclab/Leaflet.DistortableImage/actions/runs/3338976962/jobs/5601653375

Thanks!