[TASK] Improve prevention of redirect loop

This prevents a redirect loop with realurl where an editor
doesn't see the pagetree of his login domain in his workspace
and opens his login domain in the FE. As result he sees the
requested page.

Resolves: #82297
Releases: master, 8.7
Change-Id: Ie948f6defa21e3e1d8766533f54a48769d2220c9
Reviewed-on: https://review.typo3.org/53977


Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Henning Liebe <h.liebe@neusta.de>
Reviewed-by: Steffen Frese <steffenf14@gmail.com>
Reviewed-by: Reiner Teubner <rteubner@me.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>