[BUGFIX] Update tstamp on inline relation addition

If in a record with an inline relation a new relation
is added and nothing else is changed the timestamp
was not updated.

The logic to update the timestamp has now been added
to the remapStack processing.

Change-Id: I2eae7d1fb54b21dddc6e3609b1585ba484980b06
Resolves: #82576
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/54423


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>