Fixed test failures of WindowTest

When cutout mode is always/shortEdges and the system window insets are
consumed, the cutout isn't consumed and is inset to an empty cutout
which causes the test failure.

We should also consume cutout when the system window insets contain
cutout and are consumed.

Bug: 253995206
Test: atest WindowTest WindowInsetsTest DecorInsetTests
Change-Id: I8a4fd56675509cc27dfa91de1138458fb1e7b0f0