Patch correcting typo in lyx_2_1.py

[José Abílio Matos]

On Sunday, 29 December 2019 15.53.32 WET Richard Kimberly Heck wrote:
> Yes, that's fine.
> 
> Riki

And it is already in after your message from last November (from this year 
fortunately). :-)

-- 
José Abílio