Don't account space for non-touchable windows

CL:5932654 fixes the order of the focused window, and it also changes the
computation of unaccountedSpace not to ignore non-touchable windows when
it is focused.
As a result, windows behind the focused but non-touchable window are not
sent, but we need their information.

bug:188159248
Test: atest CtsPackageInstallerTapjackingTestCases, atest
CtsAccessibilityServiceTestCases, atest CtsUiAutomationTestCases

Change-Id: I155ab6ae4e95c763c9befe93f2d41fcdb03f083e