Apply suggestions from code review from Cecille

Adding these suggestions from Cecille after testing in local dev env

Co-authored-by: C Freeman <cecille@google.com>

Author: j-ororke

src/python_testing/TC_TIMESYNC_2_1.py

@@ -51,10 +51,10 @@ async def test_TC_TIMESYNC_2_1(self):
         self.supports_ntps = bool(features & Clusters.TimeSynchronization.Bitmaps.Feature.kNTPServer)
         self.supports_trusted_time_source = bool(features & Clusters.TimeSynchronization.Bitmaps.Feature.kTimeSyncClient)
 
-        time_cluster = Clusters.Objects.TimeSynchronization
-        timesync_attr_list = Clusters.Objects.TimeSynchronization.Attributes.AttributeList
+        time_cluster = Clusters.TimeSynchronization
+        timesync_attr_list = time_cluster.Attributes.AttributeList
         attribute_list = await self.read_single_attribute_check_success(endpoint=endpoint, cluster=time_cluster, attribute=timesync_attr_list)
-        timesource_attr_id = Clusters.Objects.TimeSynchronization.Attributes.TimeSource.attribute_id
+        timesource_attr_id = time_cluster.Attributes.TimeSource.attribute_id
 
         self.print_step(1, "Commissioning, already done")
         attributes = Clusters.TimeSynchronization.Attributes