bezier-rs demo miter limit doesn't work

[dzaima]

The "join: Miter - limit" options on https://graphite.rs/libraries/bezier-rs/ don't appear to do anything.

I believe it should be the variable: "join: Miter - limit"s not matching options.miter_limit, but don't have the dev env set up to properly test.

[Keavon]

Thanks for noticing this, I probably broke it in my recent code simplifications. I set a reminder to myself to come back next month when I have more time and try to fix this. If you want to open a PR to fix it sooner, that'd be ideal.