Revert "[BUGFIX] Session cookie is not recreated on login"

This reverts commit 76741dff7b967b88aa1d6e556500a77716c7a97a
(https://review.typo3.org/29626)

This change is not needed any more as the fix done
for #58713 also fixes the issues targeted with this fix.

This should be reverted not only because it is not needed
any more but especially because it "abuses" the property
->newSessionID which should only be set when really
a new ID has been generated and not to force the cookie
to be set again.

Releases: 6.2
Resolves: #59614
Reverts: #57751
Related: #58713
Change-Id: I5324769b0795bcc1b1f1e385c73fd085d7b3f571
Reviewed-on: https://review.typo3.org/30753
Reviewed-by: Markus Klein
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel