tex2lyx roundtrip tests broken on master

[Jürgen Spitzmüller]

Am Samstag, dem 06.03.2021 um 14:28 -0500 schrieb Scott Kostyshak:
> The tex2lyx roundtrip tests are broken on master.

Fixed. As so often, forgot to update the tests after file format bump.

Jürgen

> 
> Scott

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