[Hotfix] Fix flaky test_basic_workflows_2

This test seems very flaky after the nested tasks PR merged. I think it's since the test is broken, and we made one of the branches more likely.

python/ray/workflow/tests/test_basic_workflows_2.py

@@ -174,7 +174,7 @@ def wait(obj_ref):
     except Exception:
         v = None
     if v is not None:
-        assert 2 == 20
+        assert 2 == v
     assert 4 == ray.get(outer)
 
     inner = workflow.get_output("double-2", name="inner")