[BUGFIX] Use hashed sessionId to find existing session

The backend module for backend users needs to use the hashed sessionId
to check the online status if the session backend allows hashed ids.

Resolves: #92871
Releases: master, 10.4, 9.5
Change-Id: Ifb5c2f48c751a52233888b293347425afd3092ae
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66697


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>