[BUGFIX] Remove dummy JS code in PageLayoutController

The statement does nothing so it is removed.

Resolves: #85103
Releases: master
Change-Id: Ib9b20392d837262bd3d98069d2998c8c6a372dfc
Reviewed-on: https://review.typo3.org/57073


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>