Remove workaround disabling hidden api checks - windowmanager

The new approach is a lot more focused and still allows tests to be run

Test: android.server.wm.AssistantStackTests#testLaunchIntoSameTask
Test: android.server.wm.AssistantStackTests#testAssistantStackFinishToPreviousApp
Test: android.server.wm.ActivityTaskAffinityTests
Test: android.server.wm.MultiDisplayPolicyTests

Bug: 174293759
Bug: 166236554
Change-Id: I4f1bdb936062cf54892a538b4f2b4edf6e06347f
1 file changed