[LyX/master] Fix clear button in FancyLineEdit

[Richard Kimberly Heck]

On 3/12/25 10:22 AM, Jürgen Spitzmüller wrote:
> Am Mittwoch, dem 12.03.2025 um 14:20 +0000 schrieb Juergen
> Spitzmueller:
>> commit 96262763c3a5e79d44e9429255e4ad1b591bf857
>> Author: Juergen Spitzmueller <spitz at lyx.org>
>> Date:   Wed Mar 12 15:18:34 2025 +0100
>>
>>      Fix clear button in FancyLineEdit
>>      
>>      Use the icon from the theme and consider dark mode
> Should also go to stable.

OK!

Riki