[BUGFIX] Use consistent markup for callout with icons

The "icon-emphasized" class has been recently introduced for
FontAwesome replacement and should be used consistently.

Resolves: #99087
Related: #99038
Releases: main
Change-Id: I86ee49446ed91ec44efb579bc50b6263fb2a8479
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76600


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>