Can't disable Cloud Sync tasks

Comment from Caleb:

Caleb St. John 

Customer traceback while trying to disable Cloud Sync:

[2020/03/24 15:58:43] (WARNING) application.call_method():200 - Exception while calling cloudsync.update(*[1, {'description': 'Git', 'direction': 'PUSH', 'attributes': {'bucket': 'bfcs-test', 'encryption': 'AES256', 'folder': 'git'}, 'path': '/mnt/bfcs/pool/git', 'transfer_mode': 'SYNC', 'encryption': True, 'filename_encryption': False, 'encryption_password': 'B3Nj@m1n', 'encryption_salt': 'B3Nj@m1n', 'enabled': False, 'credentials': 1, 'schedule': {'minute': '00', 'hour': '00', 'dom': '*', 'month': '*', 'dow': '*'}}])
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 166, in call_method
    result = await self.middleware.call_method(self, message)
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1093, in call_method
    return await self._call(message['method'], serviceobj, methodobj, params, app=app, io_thread=False)
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1040, in _call
    return await methodobj(*args)
  File "/usr/local/lib/python3.6/site-packages/middlewared/service.py", line 295, in update
    f'{self._config.namespace}.update', self, self.do_update, [id, data]
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1040, in _call
    return await methodobj(*args)
  File "/usr/local/lib/python3.6/site-packages/middlewared/schema.py", line 664, in nf
    return await f(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/middlewared/plugins/cloud_sync.py", line 509, in do_update
    await self._validate(verrors, "cloud_sync_update", cloud_sync)
  File "/usr/local/lib/python3.6/site-packages/middlewared/plugins/cloud_sync.py", line 384, in _validate
    await provider.pre_save_task(data, credentials, verrors)
  File "/usr/local/lib/python3.6/site-packages/middlewared/plugins/../rclone/remote/s3.py", line 48, in pre_save_task
    self._get_client(credentials).get_bucket_location, Bucket=task["attributes"]["bucket"]
  File "/usr/local/lib/python3.6/site-packages/middlewared/main.py", line 1000, in run_in_thread
    return await async_run_in_executor(loop, executor, method, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/middlewared/utils/asyncio_.py", line 38, in async_run_in_executor
    result = await loop.run_in_executor(executor, _noexec_wrapper, method, *args, **kwargs)
TypeError: run_in_executor() got an unexpected keyword argument 'Bucket'