Auto merge of #25540 - pylbrecht:raqote, r=jdm

Fix canvas wpt test ensuring there's a subpath when drawing bezier curves

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These changes will ensure there's a subpath when drawing bezier curves.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix part of #25331

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- [x] There are tests for these changes

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