Fix issue in attached layouting

When we forced the parent to draw behind the navigation bar,
overscan/display are extended towards the bottom of the screen,
which will cause attached windows to layout behind the navigation
bar.

To fix this, we intersect these frames with DF.RestrictedOverscan
in case we forced the window to draw behind to keep compatibility.

Test: AccessibilityWindowQueryTest
Fixes: 130231322
Change-Id: I66f5ad4fab1f173e5b61e7d61d1e0bb0dafe66e5