[v3 SVG] .MathJax path

Just a random note after trying to reduce the stylesheet generated by the SVG output. At

https://github.com/mathjax/MathJax-src/blob/fbd71f3f7ca06dc71304e8a2c03f13be233ccac5/ts/output/svg/Wrappers/TextNode.ts#L49-L53

the stylesheet sets .MathJax path { stroke-width: 3}.

I believe this has no effect (except when disabling fontCache) since it will not match the path in a use element shadow DOM.