Set the ID of TV grant layout to grant_dialog

CTS now requires grant dialogs to have a UI element with the ID of
"grant_dialog" or three cases in CtsPermissionTestCases will not
pass.

The case we need to comply with now is a parameterised test:
  - UndefinedGroupPermissionTest#testOtherGroupPermissionsNotGranted

Test: atest android.permission.cts.UndefinedGroupPermissionTest
Test: atest CtsPermissionTestCases
Test: atest CtsPermission2TestCases
Test: atest CtsPermission3TestCases
Bug: 155356284
Change-Id: Id399dc0703b4de7e436b7ba320eabcfb033acdd0