Parent window in sizeLessWindow test was using software pipeline at
least on webOS, causing a QCRITICAL() exit when the test was executed.
Fixes: QTBUG-101869
Pick-to: 6.3
Change-Id: Ie8cc0ea0b6a09729475389be44197e01a45b217f
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>