[varfont/duplexed_axis_reflow] Output flagged locations in user/design coordinates instead of normalized

[Hoolean]

Observed behaviour

When the check identifies variation across a duplex axis, it identifies the glyph and position in normalized coordinates, e.g.

ampersand at position wght=0.333333333

Expected behaviour

To find the problem quickly in the sources, it would be helpful for the coordinates to be in design or user coordinates, e.g.

ampersand at position wght=500

Resources and steps needed to reproduce

I do not have a font file to immediately link to, but can reproduce with Fontspector v1.5.1 (latest at time of writing) and can narrow it to here in the code:

fontspector/profile-universal/src/checks/varfont_duplexed_axis_reflow.rs

Line 85 in e4722fe

.map(|(value, axis)| format!("{}={}", axis, value.get().to_f32()))

(if still needed though, do shoot a ping 🙏)

Thanks for your attention : )