[BUGFIX] Make DBgetDelete() update tstamp on delete by update

If told to do so by TCA ContentObjectRenderer::DBgetDelete()
will not immediately delete a row but mark it as deleted.
This change updates the tstamp (if that column is configured)
for that "updated" row as well, like on a regular update.

Fixes: #47354
Releases: 6.2, 6.1
Change-Id: I61b9ce7d8608b73cfb974e79d2f9f59e6dc3547a
Reviewed-on: https://review.typo3.org/22286
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn