Use core constants for simplepush (#46465)

homeassistant/components/simplepush/notify.py

@@ -8,13 +8,12 @@ from homeassistant.components.notify import (
     PLATFORM_SCHEMA,
     BaseNotificationService,
 )
-from homeassistant.const import CONF_PASSWORD
+from homeassistant.const import CONF_EVENT, CONF_PASSWORD
 import homeassistant.helpers.config_validation as cv
 
 ATTR_ENCRYPTED = "encrypted"
 
 CONF_DEVICE_KEY = "device_key"
-CONF_EVENT = "event"
 CONF_SALT = "salt"
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
@@ -44,7 +43,6 @@ class SimplePushNotificationService(BaseNotificationService):
 
     def send_message(self, message="", **kwargs):
         """Send a message to a Simplepush user."""
-
         title = kwargs.get(ATTR_TITLE, ATTR_TITLE_DEFAULT)
 
         if self._password: