QQuickOverlay: use qobject_cast instead of static_cast

This mirrors the behavior of QQuickOverlayPrivate::addPopup
While this might not be an issue in practice, as removeOne should fail
nevertheless, this avoids a warning from UBSan and should have only a
negligible performance impact.
The warning appears for instance in the (otherwise unrelated) example
from bug QTBUG-80070:

qquickoverlay.cpp:258:63: runtime error:
downcast of address 0x55d6e1b34860 which does not point to an object of
type 'QQuickDrawer'
0x55d6e1b34860: note: object is of type 'QQuickPopup'

Change-Id: Ic51979ad25e864151245b6d47c733696a099bde8
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

0 files changed, 0 insertions, 0 deletions