qt.svg incorrectly encoded content

[Pavel Sanda]

Hi,

this is in master:

- open preference and this appears on terminal:

qt.svg: Cannot read file '/lyx/devel/lib/images/classic/dialog-show_spellchecker.png', because: Encountered incorrectly encoded content. (line 1)
qt.svg: Cannot read file '/lyx/devel/lib/images/classic/thesaurus-entry.png', because: Encountered incorrectly encoded content. (line 1)

Bisect leads to:

commit 548c5ba92dfd2d4d845266e392748ad18ff1ec04
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sat Mar 11 16:10:52 2023 +0100

    Two more icon scale fixes


Pavel