[QuickControls] Highlight of the controls is square instead of round

MacOS 15.4.1

Qt Creator 16.0.2

Qt 6.10.0 (dev snapshot)

Device: Pixel 5 13.0

Steps to reproduce:

1. Make sure the Material UI is selected as the main style.
2. Run quickcontrols gallery example
3. Open Dial or Slider page
4. Drag and move the handle.

Expected: The highlight should be a circle as it was on 6.9.1.

Actual: The highlight of the handle is a square, not a circle, as it used to be. See video to check the difference between 6.9.1 and 6.10.0.

Reproducibility:  100%