Fix isWebWorker check #1376
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Fix isWebWorker check #1376
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The problem here is that there is a false positive on Cloudflare Workers that makes jimp think that it is running in a WebWorker, which makes it fail on loading fonts.
This PR fix that, one step beyond to a better support for CF Workers.
Ref: https://stackoverflow.com/questions/7931182/reliably-detect-if-the-script-is-executing-in-a-web-worker
Related #1358