using wide unicode characters in progress_chars results in a too wide bar being drawn

[whirm]

I've just upgraded my project to 0.17.0 from 0.16.2 and I've noticed that a bar that's using

    template.progress_chars("🔐🔑🕓");

now draws incorrectly:

With 0.16.2 it worked just fine:

line on my Cargo.toml:

indicatif = { version = "0.17.0", features = ["improved_unicode", "tokio"] }

Thanks for this project!

[djc]

Oops, sorry about that! Looks like I made a typo while refactoring in d7851c7, fix submitted in #456.