Auto merge of #25551 - pylbrecht:raqote, r=jdm

Fix canvas wpt test `path-objects/2d.path.rect.zero.4.html`

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After connecting the lines of a rectangle, a new subpath has to be created containing the rectangle's origin as the only point in the subpath.
(see step 4 of https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-rect)

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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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