Remove hidden property from egardia integration (#30728)

homeassistant/components/egardia/binary_sensor.py

@@ -64,12 +64,6 @@ class EgardiaBinarySensor(BinarySensorDevice):
         """Whether the device is switched on."""
         return self._state == STATE_ON
 
-    @property
-    def hidden(self):
-        """Whether the device is hidden by default."""
-        # these type of sensors are probably mainly used for automations
-        return True
-
     @property
     def device_class(self):
         """Return the device class."""