[BUGFIX] Respect line breaks in media's description

As the description is using a textarea element in the backend,
editors can add a multi-line text.
The line breaks should be shown in the frontend as well by using
f:format.nl2br.

Resolves: #89611
Releases: master
Change-Id: Ia2b1b2ef896004b1ec91a1719d48826efdc3fb91
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62629


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Jan Stockfisch <typo3@jan-stockfisch.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>