ctests for Additioonal.lyx lyx2lyx round trip failing on master

[Scott Kostyshak]

To reproduce, export Additional.lyx to 2.3.x format. Then open that
exported file in master and compile.

There are two issues (perhaps in the end the same?):

1. Terminal output gives the following:

  Paragraph ended in line 26020
  Missing \end_layout.

2. There is a LaTeX error:

! Missing } inserted.
<inserted text> 
                }
l.5938 ...e up/down/\\left/right\end{cellvarwidth}
                                                  }

I believe we don't require compilation to succeed, so if fixing (2) is
too complicated, let me know and I'll adapt the tests.

Scott
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