Fix test_synchronize_remote_rename_while_download_file()

$ python -m pytest -n0 tests/old_functional/test_remote_move_and_rename.py::TestSyncRemoteMoveAndRename::test_synchronize_remote_rename_while_download_file

    def test_synchronize_remote_rename_while_download_file(self):
        local = self.local_1
        remote = self.remote_document_client_1
    
        def callback(uploader):
            """ Add delay when upload and download. """
            if not self.engine_1.has_rename:
                # Rename remote file while downloading
                self.remote_1.rename(self.folder_id, "Test folder renamed")
                self.engine_1.has_rename = True
            time.sleep(3)
            Engine.suspend_client(self.engine_1, uploader)
    
        self.engine_1.has_rename = False
    
        with patch.object(self.engine_1.remote, "download_callback", new=callback):
            file = self.location / "resources" / "files" / "testFile.pdf"
            content = file.read_bytes()
            remote.make_file("/Test folder", "testFile.pdf", content=content)
    
            # Rename remote folder then synchronize
            self.wait_sync(wait_for_async=True)
>           assert not local.exists("/Test folder")
E           AssertionError: assert not True