fixed 'on_startup() takes 0 positional arguments but 1 was given' (ho…

…me-assistant#17295)

homeassistant/components/sensor/miflora.py

@@ -106,7 +106,7 @@ def __init__(self, poller, parameter, name, unit, force_update, median):
     async def async_added_to_hass(self):
         """Set initial state."""
         @callback
-        def on_startup():
+        def on_startup(_):
             self.async_schedule_update_ha_state(True)
 
         self.hass.bus.async_listen_once(EVENT_HOMEASSISTANT_START, on_startup)