[BUGFIX] Swap title and message of notification when creating a backend user

When a backend user is created via the Install Tool, a notification is
rendered to tell the system maintainer that the action was successful.
However, the original patch mixed up the title and the message, which is
now fixed.

Resolves: #101741
Related: #91461
Releases: main, 12.4, 11.5
Change-Id: Ie25efa0476a118cfaa99a54d3cb4fe27ca5ef8e7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80676


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>