Make DBgetDelete() update tstamp on delete by update
In ContentObjectRenderer::DBgetDelete() it is possible that TCA for a table instructs TYPO3 to not really delete the row but only mark it as deleted. If that happens an "update" is performed - and thus the tstamp (if present) should be updated as well to be able to see which rows were (recently) modified/deleted.
This is the case since "forever" (at least 4.5, but surely longer). Thus if we decide to change this behavious, we should maybe also do so for master or maybe in 6.1 but not too much further down. It's imho not a "hard" behaviour-breaking change since until now you could not rely on tstamp being updated - and now the row will be visible as recently changed. But it's a behaviour-change after all.