[!!!][TASK] Remove constant TYPO3_PROCEED_IF_NO_USER

The constant TYPO3_PROCEED_IF_NO_USER was removed. This option is not necessary anymore, as it is taken care of by the Backend Routing now.

Resolves: #72476
Releases: master
Change-Id: Iecc31a6749fbc591ec72a1477a3255cf82738c9d
Reviewed-on: https://review.typo3.org/45503


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>