Revert "Use onEntered in KickoffItemDelegate"
This reverts commit 8042ae81. This change slightly improved performance, but subtle implementation differences between the onEntered: and onPositionChanged: handlers in MouseArea triggered two subtle and annoying bugs that users have reported a bunch of duplicates of. A way to fix the bugs using onEntered has not been found, so let's revert the change for now; slightly worse performance is a less severe issue then these bugs are. BUG: 454349 BUG: 455674 FIXED-IN: 5.25.5