Use windowInsets for bottomGestureSize instead of gestureInsets

- getTargetInsets will be reverted to its behavior before ag/15431427
- getBottomGestureSize will use the new getWindowInset call uses windowInsets instead of the max of windowInsets/gestureInsets, with the taskbar inset calibration

Bug: 195263971
Test: com.android.launcher3.ui.widget.AddWidgetTest#testDragCustomShortcut
Change-Id: I89368edee5252a404ef490db6540734ec4806f2b
3 files changed