[2.11..2.13] handle_children: Fix denying of adding a hat

Merged Christian Boltz requested to merge cboltz/apparmor:cboltz-fix-deny-hat into apparmor-2.13

Choosing "Deny" when handle_children() asks about adding a hat should not add that hat, but it should not leave the function because that means all the other log events that were not migrated to prelog yet will be lost.

Change "return" to "continue" to fix this.

I propose this for 2.11..2.13.

The master branch will get this fixed as part of !377 (merged)