style(ntfy): fix bracket-spacing lint offenses

app/controllers/concerns/admin_authentication.rb

@@ -0,0 +1,11 @@
+module AdminAuthentication
+  extend ActiveSupport::Concern
+
+  def current_admin
+    @current_admin ||= AdminUser.find_by(id: session[:admin_id]) if session[:admin_id]
+  end
+
+  def logged_in?
+    current_admin.present?
+  end
+end