[LyX/master] Remove unneeded code

[Jean-Marc Lasgouttes]

Le 27/07/2022 à 13:38, Scott Kostyshak a écrit :
> JMarc, can you double-check it is intended (after a65e12d6) that this
> code is no longer needed?
> 
> It is a nice auxiliary effect that your commit got rid of a "FIXME".
> Only 885 FIXMEs left (in the src directory).

Thanks for the fixup. It was supposed to be removed, but this hunk got 
lost when I split the commit in three.

Concerning the FIXME, indeed this is the kind of hardcoding I'd like to 
kill from the source.

JMarc