Fix the position of a11y floating menu was not centered when switching the size under half oval type.

Solution:
Adjust the compute related to the center point of the menu.

Extra action:
Fine-tune layout parameters by new resource value to meet UX style.

Bug: 189448323
Test: atest AccessibilityFloatingMenuViewTest AccessibilityTargetAdapterTest
Change-Id: I096931ed7d232877805ebca372ad370a58028abc
5 files changed