push to hub fails with huggingface-hub 0.5.0
## Describe the bug
`ds.push_to_hub` is failing when updating a dataset in the form "org_id/repo_id"

## Steps to reproduce the bug
```python
from datasets import load_dataset
ds = load_dataset("rubrix/news_test")
ds.push_to_hub("<your-user>/news_test", token="<your-token>")
```

## Expected results
The dataset is successfully uploaded

## Actual results
An error validation is raised:

```bash
if repo_id and (name or organization):
>           raise ValueError(
                "Only pass `repo_id` and leave deprecated `name` and "
                "`organization` to be None."
E               ValueError: Only pass `repo_id` and leave deprecated `name` and `organization` to be None.
```

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.18.1
- `huggingface-hub`: 0.5
- Platform: macOS
- Python version: 3.8.12
- PyArrow version: 6.0.0

cc @adrinjalali 
