[BUGFIX] IRRE: expandAll show content of all children

The \TYPO3\CMS\Backend\Form\FormDataProvider\TcaColumnsProcessShowitem
data provider has to ensure that if expandAll for IRRE (collapseAll = false)
is used that every child is rendered, instead of only those with the
expanded state.

Change-Id: I985437668554e568623f947639edddd9cb1b1530
Resolves: #71523
Releases: master
Reviewed-on: https://review.typo3.org/44695


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>