[NTG-context] Switching fonts changes framedtext justification

[Thangalin]

Confirmed there is a font issue with LMTX.

$ context --version
mtx-context     | current version: 2022.04.01 09:37

The issue was also present with version 2021.11.30.

> Are you sure it's not a tolerance issue?

Pablo's example also doesn't justify, so \framedtext is a red herring.

The .otf file is from:

https://github.com/MorbZ/OpenSansEmoji

Thanks everyone!