change RemoteConfig mock to be worker.RemoteConfigPoller (#340)

Author: duncanista

tests/test_wrapper.py

@@ -31,7 +31,7 @@ class TestDatadogLambdaWrapper(unittest.TestCase):
     def setUp(self):
         # Force @datadog_lambda_wrapper to always create a real
         # (not no-op) wrapper.
-        patch("ddtrace.internal.remoteconfig.RemoteConfig").start()
+        patch("ddtrace.internal.remoteconfig.worker.RemoteConfigPoller").start()
         patch("ddtrace.internal.writer.AgentWriter.flush_queue").start()
 
         wrapper.datadog_lambda_wrapper._force_wrap = True