[BUGFIX] t3editor: Load TS located in rootline

Adding 'pid' to the form, t3editor now loads the TypoScript
that is placed in any page of the current rootline.

Resolves: #82623
Releases: master
Change-Id: I9364bb4a60d475be52bbcc5079b4c3a6e9cb42ec
Reviewed-on: https://review.typo3.org/54242


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>