Properly skip infrequent polling test on time-skipping server

Fixes #184

Author: cretz

tests/polling/infrequent/workflow_test.py

@@ -10,7 +10,7 @@
 
 
 async def test_infrequent_polling_workflow(client: Client, env: WorkflowEnvironment):
-    if not env.supports_time_skipping:
+    if env.supports_time_skipping:
         pytest.skip("Too slow to test with time-skipping disabled")
 
     # Start a worker that hosts the workflow and activity implementations.