Properly handle pending intent for multi-user

Use getActivityAsUser instead of getActivity to
handle pending intent for multi-user

Test: atest CtsCompanionDeviceManagerCoreTestCases
      atest CtsCompanionDeviceManagerUiAutomationTestCases
      atest CtsOsTestCases:CompanionDeviceManagerTest
Fix: 218790259, 218790145, 218790302
Change-Id: Id3cd06dfe53ba3b36b1fc06d2d942bd6d1c19a4a
1 file changed