[LyX/master] Fix signal

[Jürgen Spitzmüller]

Am Donnerstag, dem 23.01.2025 um 09:51 +0000 schrieb Juergen
Spitzmueller:
> commit f73f3b1b353b3c979305b06163df008def7d202e
> Author: Juergen Spitzmueller <spitz at lyx.org>
> Date:   Thu Jan 23 10:51:31 2025 +0100
> 
>     Fix signal

Also needed in branch (with Qt 6).

-- 
Jürgen