Migrations: Nullify old unique index on users.uri

priv/repo/migrations/20200928145912_revert_citext_change.exs

@@ -6,6 +6,6 @@ defmodule Pleroma.Repo.Migrations.RevertCitextChange do
       modify(:uri, :text)
     end
 
-    create_if_not_exists(unique_index(:users, :uri))
+    # create_if_not_exists(unique_index(:users, :uri))
   end
 end