Simplify statsport fixture in statschannel test

The ports fixture provides the required port numbers already and there's
no need to get the port number from environment.

bin/tests/system/statschannel/conftest.py

@@ -9,17 +9,9 @@
 # See the COPYRIGHT file distributed with this work for additional
 # information regarding copyright ownership.
 
-import os
 import pytest
 
 
-@pytest.fixture
-def statsport(request):
-    # pylint: disable=unused-argument
-    env_port = os.getenv("EXTRAPORT1")
-    if env_port is None:
-        env_port = 5301
-    else:
-        env_port = int(env_port)
-
-    return env_port
+@pytest.fixture(scope="module")
+def statsport(ports):
+    return ports["EXTRAPORT1"]