[TASK] Remove cookie warning in ext:felogin

The cookie warning message in ext:felogin depends on conditions
which are never met and can not be fixed easily. Additionally,
failed authentication in ext:felogin already shows a similar
message, so the non-working cookie message can safely be removed.

This change removes code affecting the non-working cookie warning
message.

Resolves: #100135
Related: #99710
Releases: main
Signed-off-by: Torben Hansen <derhansen@gmail.com>
Change-Id: I952fe5d797a7e3d49cc31c87d2d992b1d117626b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78089


Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>