[BUGFIX] Avoid reading value from undefined variable

Show columns selection functionality has been improved
for issue #94474, but during refactoring some code it
falsly tries to read the 'pageId' parameter from undefined
'$parsedBody' instead of the available variable $queryArguments,
which is used to pass to another method.

This patch now fetch the pageId from query arguments and remove
the usage of the undefined variable.

Resolves: #96594
Related: #94474
Releases: main, 11.5
Change-Id: Idb0350b235c8dfc2b49b001d0394d9a27c20c3fb
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73078


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>