Fix web push notifications for polls (#10864)

Fixes #10861

app/controllers/api/v1/push/subscriptions_controller.rb

@@ -51,6 +51,6 @@ class Api::V1::Push::SubscriptionsController < Api::BaseController
 
   def data_params
     return {} if params[:data].blank?
-    params.require(:data).permit(alerts: [:follow, :favourite, :reblog, :mention])
+    params.require(:data).permit(alerts: [:follow, :favourite, :reblog, :mention, :poll])
   end
 end