Auto merge of #22465 - Coder206:userscripts, r=avadacatavra

Update userscripts Option

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userscripts is now formatted as `userscripts=`

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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
No success for building `mozjs` on Ubuntu 16.04 system
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #22462 (GitHub issue number if applicable)

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___
Not sure, I plan to run `./mach test-perf`
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