Dismiss system windows on screenshot action

Bug: 309933761
Fix: 309933761
Flag: ACONFIG com.android.systemui.screenshot_action_dismiss_system_windows DEVELOPMENT
Test: take a screenshot with system overlay visible (e.g. power menu)
and verify that after tapping screenshot buttons, the overlay disappears
Test: atest ActionIntentExecutorTest

Change-Id: I4502fe84de520c6ebaf06749807bead0f023bfae