Do not normalize objects in stream_out unless the activity type is

Create

Saves quite a bit of time with delete activities because they would
always query the db

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -168,7 +168,6 @@ def stream_out(activity) do
     public = "https://www.w3.org/ns/activitystreams#Public"
 
     if activity.data["type"] in ["Create", "Announce", "Delete"] do
-      object = Object.normalize(activity)
       Pleroma.Web.Streamer.stream("user", activity)
       Pleroma.Web.Streamer.stream("list", activity)
 
@@ -180,6 +179,8 @@ def stream_out(activity) do
         end
 
         if activity.data["type"] in ["Create"] do
+          object = Object.normalize(activity)
+
           object.data
           |> Map.get("tag", [])
           |> Enum.filter(fn tag -> is_bitstring(tag) end)