[BUGFIX] Show latest rss entries first in rss widget

Sort rss entries before reducing to shown limit.

Resolves: #90770
Releases: master
Change-Id: Ia95d36a06408d115fb92786c361c21227f06c792
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63756


Tested-by: Richard Haeser <richard@maxserv.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Richard Haeser <richard@maxserv.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>