Non-WWS compatible fonts: WWS names are not written to instance OTFs

[InterWWS.zip](https://github.com/googlefonts/glyphsLib/files/9735569/InterWWS.zip)

The glyphs file contains some instances which don't have WWS-compatible names, and are marked as such:

Family Name: Inter
Style Name: Display Bold
WWS Family Name: Inter Display
WWS Style Name: Bold

Building static OTFs with this command, the WWS names are not written to the OTF nametables:

```
fontmake -g Inter-Roman.glyphs -o otf -i
```

They are also not in the instance UFOs generated by glyphsLib.

```
fontmake -g Inter-Roman.glyphs -o ufo -i
```

Reproduce the issue with Inter-Roman.glyphs using the fontmake commands shown for OTF and UFO output. Inspect the generated instance UFOs and OTF nametables for the WWS Family Name and WWS Style Name fields; done means both outputs preserve the marked WWS-compatible names.

Written by the indexing model from the issue text.