[BUGFIX] Always use backend form protection in backend URI builder

Backend edit links in frontend editing used FrontendFormProtection
when a frontend user was logged in.
We force using BackendFormProtection when building URLs with the
backend UriBuilder now.

Resolves: #72582
Releases: master, 7.6
Change-Id: I6cd33c47cfed2eeb30af84c3dc40f8e54f3bf197
Reviewed-on: https://review.typo3.org/45687


Reviewed-by: Christian Weiske <typo3@cweiske.de>
Tested-by: Christian Weiske <typo3@cweiske.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>