Avoid unnecessary wait in test

This test is testing deploying local charm with channel argument. It
would fail at the deploy if something's wrong, so no need to actually
wait for the active status after deploy. The final assert in the test
makes sure the deploy was successful.

Author: cderici

tests/integration/test_model.py

@@ -223,8 +223,6 @@ async def test_deploy_local_charm_channel(event_loop):
     async with base.CleanModel() as model:
         await model.deploy(str(charm_path), channel='stable')
         assert 'charm' in model.applications
-        await model.wait_for_idle(status="active")
-        assert model.units['charm/0'].workload_status == 'active'
 
 
 @base.bootstrapped