Fix `run_clip.py`
# What does this PR do?

The type annotation for `Transform.forward` (in `run_clip.py`) never work when I tried several torch/pillow versions.
This forward is compiled by `torch.jit`.

With the current type annotation `x: Image`, we get error
```bash
RuntimeError: 
Unknown type name 'Image':
```

With `x: Image.Image`, error is
```bash
NotSupportedError: Compiled functions can't take variable number of arguments or use keyword-only arguments with defaults:
  File "/home/huggingface/miniconda3/envs/py38/lib/python3.8/site-packages/PIL/Image.py", line 550
    def __exit__(self, *args):
                       ~~~~~ <--- HERE
        if hasattr(self, "fp") and getattr(self, "_exclusive_fp", False):
            if getattr(self, "_fp", False):
'__torch__.PIL.Image.Image' is being compiled since it was called from 'Transform.forward'

```
_The documentation is not available anymore as the PR was closed or merged._