[TASK] Streamline usage of BackendUtility::getPagesTSconfig()

Avoid calling BackendUtility::getPagesTSconfig() with default or useless
parameters.

Resolves: #53502
Releases: 6.2
Change-Id: I842c33022a00f5633b1ef5a250d143b6a253dde1
Reviewed-on: https://review.typo3.org/25249
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack