Corrected log message in TC_DEM_2.9 step 4b

Author: jamesharrow

src/python_testing/TC_DEM_2_9.py

@@ -108,7 +108,7 @@ async def test_TC_DEM_2_9(self):
             asserts.assert_is_not_none(forecast.slots[0].maxPower)
             asserts.assert_is_not_none(forecast.slots[0].nominalEnergy)
         else:
-            logging.info('Device does not support StateForecastReporting. Skipping step 4b')
+            logging.info('Device does not support PowerForecastReporting. Skipping step 4b')
 
         self.step("5")
         await self.send_test_event_trigger_forecast_clear()