Consider task's root activity when determining if resizable.

We consider an activity resizable if the root activity of the its
parent task is resizable. This changelist adds this condition to
consideration.

Change-Id: I4162ff7eb6cad3f4a3f9fdf35ccc0b0d2383ff15
Fixes: 65668913
Test: bit FrameworksServicesTests:com.android.server.am.ActivityRecordTests#testCanBeLaunchedOnDisplay
Test: cts/hostsidetests/services/activityandwindowmanager/util/run-test CtsServicesHostTestCases android.server.cts.ActivityManagerDisplayTests#testLaunchNonResizeableActivityFromSecondaryDisplaySameTask