[BUGFIX] Reset MP parameter on shortcut to MountPoint

If a page has a shortcut to a MountPoint page, the MP parameter
should not be doubled, when the mount_pid_ol flag was set.

Resolves: #90322
Releases: master, 9.5
Change-Id: I18a3109b353be2ea3367f6321b1fab1fa771fe7d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63174


Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Daniel Sattler <sattler@b13.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Daniel Sattler <sattler@b13.de>
Reviewed-by: Benni Mack <benni@typo3.org>