fix deployment using client_id

[bmc-msft]

Fix issue in client creation from #872

[bmc-msft]

In the aforementioned PR, Application.client_id isn't available.

It causes the exception:

INFO:deploy:checking if RBAC already exists
INFO:deploy:creating Application registration
INFO:deploy:creating service principal
Traceback (most recent call last):
  File "deploy.py", line 1082, in <module>
    main()
  File "deploy.py", line 1076, in main
    state[1](client)
  File "deploy.py", line 441, in setup_rbac
    "client_id": onefuzz_cli_app.client_id,
AttributeError: 'Application' object has no attribute 'client_id'