TC-TSTAT-4.2: Change to use endpoint from config

Author: cecille

src/python_testing/TC_TSTAT_4_2.py

@@ -244,7 +244,7 @@ def steps_TC_TSTAT_4_2(self) -> list[TestStep]:
 
     @ async_test_body
     async def test_TC_TSTAT_4_2(self):
-        endpoint = self.user_params.get("endpoint", 1)
+        endpoint = self.matter_test_config.endpoint
 
         self.step("1")
         # Commission DUT - already done