Add actor column to activities.

test/support/factory.ex

@@ -51,7 +51,8 @@ defmodule Pleroma.Factory do
     }
 
     %Pleroma.Activity{
-      data: data
+      data: data,
+      actor: data["actor"]
     }
   end
 

test/web/activity_pub/activity_pub_test.exs

@@ -52,6 +52,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
     test "removes doubled 'to' recipients" do
       {:ok, activity} = ActivityPub.create(["user1", "user1", "user2"], %User{ap_id: "1"}, "", %{})
       assert activity.data["to"] == ["user1", "user2"]
+      assert activity.actor == "1"
     end
   end