If we subset this test font (a subset of Google Fonts' Andika-Regular.ttf) and request to keep 'cv43', only the FirstParaUILabelNameID (324) is currently kept, the other two (325 amd 326) get incorectly dropped.
All referenced nameIDs should be kept.
This will be fixed with https://github.com/fonttools/fonttools/pull/3617
```
> assert nameIDs == keepNameIDs
E assert {0, 1, 2, 3, 4, 5, 6, 321, 322, 323, 324} == {0, 1, 2, 3, 4, 5, 6, 321, 322, 323, 324, 325, 326}
E Extra items in the right set:
E 325
E 326
E Full diff:
E - {0, 1, 2, 3, 4, 5, 6, 321, 322, 323, 324, 325, 326}
E ? ----------
E + {0, 1, 2, 3, 4, 5, 6, 321, 322, 323, 324}
```
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