Allow subscribing for pleroma:emoji_reaction push notifications

lib/pleroma/web/push/subscription.ex

@@ -25,7 +25,7 @@ defmodule Pleroma.Web.Push.Subscription do
     timestamps()
   end
 
-  @supported_alert_types ~w[follow favourite mention reblog pleroma:chat_mention]a
+  @supported_alert_types ~w[follow favourite mention reblog pleroma:chat_mention pleroma:emoji_reaction]a
 
   defp alerts(%{data: %{alerts: alerts}}) do
     alerts = Map.take(alerts, @supported_alert_types)