`"Hello 🌍!"` is horizontally shifted on macOS

I'm looking at the course for the first time ever on a MacBook and noticed that our first example of Rust code looks bad:

The `println!("Hello 🌍!");` line is shifted in a strange way. Removing the emoji fixes this:

This looks like a bug in the upstream [ACE Editor project](https://github.com/ajaxorg/ace), but I figured we could track it here as well.

This is on a Chrome browser (Version 140.0.7339.186) on macOS 15.7 (24G222), both of which should be the latest versions at the time of writing.