Remove redundant mock_storage fixture from mqtt_statestream tests (#42652)

tests/components/mqtt_statestream/test_init.py

@@ -1,6 +1,4 @@
 """The tests for the MQTT statestream component."""
-import pytest
-
 import homeassistant.components.mqtt_statestream as statestream
 from homeassistant.core import State
 from homeassistant.setup import async_setup_component
@@ -9,11 +7,6 @@ from tests.async_mock import ANY, call
 from tests.common import mock_state_change_event
 
 
-@pytest.fixture(autouse=True)
-def mock_storage(hass_storage):
-    """Autouse hass_storage for the TestCase tests."""
-
-
 async def add_statestream(
     hass,
     base_topic=None,