Make deactivated user check into a subquery

Fixes #2792

test/pleroma/web/activity_pub/activity_pub_test.exs

@@ -776,6 +776,21 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubTest do
     assert Enum.member?(activities, activity_one)
   end
 
+  test "doesn't return activities from deactivated users" do
+    _user = insert(:user)
+    deactivated = insert(:user)
+    active = insert(:user)
+    {:ok, activity_one} = CommonAPI.post(deactivated, %{status: "hey!"})
+    {:ok, activity_two} = CommonAPI.post(active, %{status: "yay!"})
+    {:ok, _updated_user} = User.set_activation(deactivated, false)
+  
+    activities = ActivityPub.fetch_activities([], %{})
+  
+    refute Enum.member?(activities, activity_one)
+    assert Enum.member?(activities, activity_two)
+  end
+
+
   test "always see your own posts even when they address people you block" do
     user = insert(:user)
     blockee = insert(:user)