fix: Minor fix of send_notification method

Author: ruflas

headset_battery_indicator/__main__.py

@@ -843,7 +843,7 @@ def on_inactivetime_changed(self, action):
 
     def send_notification(self, title, message):
         """Sends a desktop notification."""
-        self.showMessage(title, message, 10000)
+        self.showMessage(title, message, QSystemTrayIcon.Information, 10000)
 
     def update_status(self):
         """Starts the background update process."""
@@ -948,4 +948,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    main()