ensure test_win_user fails on bogus error

We weren't previously checking the error message- it failed as expected, but for the wrong reason.

test/integration/roles/test_win_user/tasks/main.yml

@@ -375,6 +375,7 @@
     that:
       - "win_user_invalid_group_result|failed"
       - "win_user_invalid_group_result.msg"
+      - win_user_invalid_group_result.msg | match("group 'Userz' not found")
 
 - name: remove test user when finished
   win_user: name="{{ test_win_user_name }}" state="absent"