[BUGFIX] Ensure new session handling works in SQLite environments

Due to some missing casting and usage of wrong properties,
a wrong comparison happened.

In addition, the change now checks for "user" instead of "userSession",
as the "userSession" property is obsolete.

Resolves: #93066
Releases: master
Change-Id: I4a0ff4797265c15e5cf9a822e4f7e1ea31fb31c1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67103


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>