[BUGFIX] Evaluate config.ftu earlier in a FE request

The TypoScript option config.ftu is used to transfer a
session via GET parameters.

However this option is - unlike other TypoScript settings
- evaluted later in a frontend request. This makes it
impossible to use the option during various hooks, where
redirect URLs are generated.

Moving this evaluation to the same place as other TypoScript
options solves the issue.

Resolves: #84963
Releases: master
Change-Id: Icfcc830d9299b362ac13105fa19dda1d418cacc5
Reviewed-on: https://review.typo3.org/56910


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>