not_authorized calls with Interface type instead of the real owner

[saharaying]

When handling the errors on field which is defined in an Interface, field.owner returns the interface module, instead of the real owner (the subclass of GraphQL::Schema::Object). Probably it should be changed to trace_data[:owner]?

    def ensure_guarded(trace_data)
      field = trace_data[:field]
      guard_proc = find_guard_proc(field.owner, field)
      return yield unless guard_proc

      if guard_proc.call(trace_data[:object], args(trace_data), trace_data[:query].context)
        yield
      else
        not_authorized.call(field.owner.graphql_definition, field.name.to_sym)
      end
    end