Move websocket config for Shoutbox to the Endpoint

This is the modern way of configuring it

config/config.exs

@@ -110,17 +110,6 @@ config :pleroma, :uri_schemes,
     "xmpp"
   ]
 
-websocket_config = [
-  path: "/websocket",
-  serializer: [
-    {Phoenix.Socket.V1.JSONSerializer, "~> 1.0.0"},
-    {Phoenix.Socket.V2.JSONSerializer, "~> 2.0.0"}
-  ],
-  timeout: 60_000,
-  transport_log: false,
-  compress: false
-]
-
 # Configures the endpoint
 config :pleroma, Pleroma.Web.Endpoint,
   url: [host: "localhost"],
@@ -130,9 +119,6 @@ config :pleroma, Pleroma.Web.Endpoint,
       {:_,
        [
          {"/api/v1/streaming", Pleroma.Web.MastodonAPI.WebsocketHandler, []},
-         {"/websocket", Phoenix.Endpoint.CowboyWebSocket,
-          {Phoenix.Transports.WebSocket,
-           {Pleroma.Web.Endpoint, Pleroma.Web.UserSocket, websocket_config}}},
          {:_, Plug.Cowboy.Handler, {Pleroma.Web.Endpoint, []}}
        ]}
     ]

lib/pleroma/web/endpoint.ex

@@ -9,7 +9,20 @@ defmodule Pleroma.Web.Endpoint do
 
   alias Pleroma.Config
 
-  socket("/socket", Pleroma.Web.UserSocket)
+  socket("/socket", Pleroma.Web.UserSocket,
+    websocket: [
+      path: "/websocket",
+      serializer: [
+        {Phoenix.Socket.V1.JSONSerializer, "~> 1.0.0"},
+        {Phoenix.Socket.V2.JSONSerializer, "~> 2.0.0"}
+      ],
+      timeout: 60_000,
+      transport_log: false,
+      compress: false
+    ],
+    longpoll: false
+  )
+
   socket("/live", Phoenix.LiveView.Socket)
 
   plug(Plug.Telemetry, event_prefix: [:phoenix, :endpoint])