Prevent squishing of the QsMediaHost when not in split shade

The QSMediaHost was being squished by QSFragment. This is the
correct behavior for split shade as that media host is onscreen
when the squishiness happens. But when split shade is disabled,
then that view should not be squished.

Bug: 232528163
Test: Manually checked the repro steps
Change-Id: Ia5025ca0745ce82db9c99013768acbc210fd8b30