[LyX/master] Fix AboutLyX layout

[Richard Kimberly Heck]

On 11/2/24 9:44 AM, Jürgen Spitzmüller wrote:
> Am Samstag, dem 02.11.2024 um 13:40 +0000 schrieb Juergen Spitzmueller:
>> commit 11cbc3c4a765f93268a662846d7082b089b3782b
>> Author: Juergen Spitzmueller <spitz at lyx.org>
>> Date:   Sat Nov 2 14:33:28 2024 +0100
>>
>>      Fix AboutLyX layout
>>      
>>      * remove wrong (sub)namespaces. This are inserted by newer
>> versions of
>>        designer, although they are wrong
>>      * add vertical spacer
>>      * make horizontal spacer expand
> Should also go to stable. Note that nowadays Designer's output cannot
> be trusted.

Cherry-picked.

Riki