MFVideoFormat_RGB24 has a BGR layout and should therefore be matched to
QVideoFrame::Format_BGR24, not Format_RGB24.
Task-number: QTBUG-42323
Change-Id: I1749b575b1738168e3d3c0d055dee10f6d870c0c
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>