Make DefaultDisplayShadePolicy the default one

This policy doesn't move the shade at all. This is needed as for now the default policy moves the shade based on status bar touched, but we want this behaviour to be enabled in dev settings for now.

Bug: 362719719
Test: None
Flag: com.android.systemui.shade_window_goes_around
Change-Id: I4791fc2015d4001e49a41d19a5a04dcafd6ef302