Allow back navigation from window edge on certain motion events.

If edge resize is permitted (e.g. using stylus, mouse) then exclude
touch regions so that window can be resized from edge. If not, (e.g.
using finger), then don't exclude touch region so users can go back from
the edge of the window.

Test: manual, position window near right edge, going back using finger
works, and using stylus resizes the window as expected.
Fixes: 362598831
Flag: com.android.window.flags.enable_windowing_edge_drag_resize

Change-Id: I2ca41383f79ce37441c630a119e2e233391514e4