[BUGFIX] Allow global RTE config again by PageTSConfig

[BUGFIX] Allow global RTE config again by PageTSConfig

With #85016 the PageTSConfig handling has been changed which
broke overloading RTE config by PageTSConfig.
This patch removes the obsolete 'properties' check to fix the problem.

Resolves: #85173
Related: #85016
Releases: master
Change-Id: I85e6d5d9d656ee578451e54f2e226e37cb101fc6
Reviewed-on: https://review.typo3.org/57138
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>