qml: fix flickering in pip player with Qt 6.7

...since otherwise the hover handler does not work.

Unfortunately, MainCtx.qtQuickControlRejectsHoverEvents() seems to be not applicable when there is an explicit hover handler, unlike where parent is a control that has hoverEnabled set. I tried to use hoverEnabled instead of an explicit hover handler, but then hovered did not work (because pip player is an overlay, its hover handling needs to be able to grab from other handlers and items).

Request review @chub.