Revert "Restrict {AM,WM}.closeSystemDialogs()"

This reverts commit 4347ccb772acf723c49fba001d2d61b2b1ca8266.

Reason for revert: Might be causing a test brekage.

Bug: 177228919
Change-Id: I15feef56c8ff409ab971886a1494ff0e677c306f
Test: atest CtsWindowManagerDeviceTestCases:WindowMetricsActivityTests
7 files changed