[BUGFIX] t3editor: Add properties from supertypes to autocomplete

Fix the condition that checks if a TypoScript property of the supertype
needs to be added to the current node in the tree.

Resolves: #68440
Releases: master
Change-Id: Ie592c84f572e6a7d849c4e73716760356d863ae9
Reviewed-on: http://review.typo3.org/42077


Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>