QtQuickView contents are sized too large

After https://codereview.qt-project.org/c/qt/qtbase/+/615252, (confirmed via git bisect to be this commit), QtQuickView content is not rendered correctly.

Steps:

• Run QtQuickView example, e.g. qtquickview_kotlin
• Observe the loaded QML Views

Expected:

• Visible buttons and rectangle grid

Actual:

• Buttons and rectangles are rendered offscreen, only the background color is visible.