When fetching a frontenduser from the database, the constuctor
is not called, but initializeObject is called. For this reason, the initialization
of the FrontendUser happens on initializeObject() as well.

Resolves: #83386
Releases: master, 10.4
Change-Id: I72e39b6485a4a072b7b94f96f947151222d68089
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65177


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>