Fix qmlscene initial resize for delayed loading

Fix qmlscene initial resize for delayed loading

When QQuickView acquires a default initial size while waiting for
the source component to be loaded, the resulting width() and height()
are 1 rather than zero.  Fix the check for default size after component
has loaded to account for this disparity.

Change-Id: Ifaf418525e66dcc094c87ac1f9b63d1b05a08fd7
Reviewed-by: Martin Jones <martin.jones@nokia.com>