[LyX/master] use std::move() instead of copying when value is no longer used

[Jürgen Spitzmüller]

Am Dienstag, dem 10.09.2024 um 15:21 +0200 schrieb Jean-Marc
Lasgouttes:
> I agree with that. However, I have not found the toggle that tells 
> Coverity to skip this proposal. This is most of our reports.

In any case, I will revert the respective commit.

-- 
Jürgen