Fixing the menu overlap with the system bars under half oval type.

Action:
Avoid overlapping with system bars under landscape mode, will
update the margins of the menu to align the edge of system bars.
But the change will also affect the shadow of the menu under
landscape mode, it may cut off the shadow edge.

Bug: 190339392
Test: atest AccessibilityFloatingMenuViewTest -c
Change-Id: If338c02618c9b45db48e5062b84ac50359c4471a