[LyX/master] Fix typo (thanks to Salvatore Falco for the fix).

[Pavel Sanda]

On Mon, Nov 04, 2019 at 12:58:42PM +0100, JosĂŠ Matos wrote:
> commit 668aa17ad7567b5969796b9a7a8f57f57a646e92
> Author: José Matos <jamatos at lyx.org>
> Date:   Mon Nov 4 12:12:23 2019 +0000
> 
>     Fix typo (thanks to Salvatore Falco for the fix).

Shouldn't this go to branch as well? P