`Multiline` control can delete unwanted records

[mvorisek]

I found this when coding #1991

https://github.com/atk4/ui/blob/4.0.0/src/Form/Control/Multiline.php#L357

the IDs to delete must come from the client/UI explicitly, otherwise rows from another sessions will be deleted at best

[mvorisek]

multiline is one usecase, editing a field that has been edited in a different session should throw in general