Fix drawSvgPath to handle the y-coord correctly

[MatheusrdSantos]

What?

It fixes the implementation of drawSvgPath to correctly handle the y-axis

Why?

Fixing the issue reported here: https://github.com/cantoo-scribe/pdf-lib/issues/49

How?

Adding an negative scaling over the y-axis

Testing?

New Dependencies?

Screenshots

Suggested Reading?

Anything Else?

Checklist

• [ ] I read CONTRIBUTING.md.
• [ ] I read MAINTAINERSHIP.md#pull-requests.
• [ ] I added/updated unit tests for my changes.
• [ ] I added/updated integration tests for my changes.
• [ ] I ran the integration tests.
• [ ] I tested my changes in Node, Deno, and the browser.
• [ ] I viewed documents produced with my changes in Adobe Acrobat, Foxit Reader, Firefox, and Chrome.
• [ ] I added/updated doc comments for any new/modified public APIs.
• [ ] My changes work for both new and existing PDF files.
• [ ] I ran the linter on my changes.