script_utils.py SyntaxWarning

I'm getting an error in script_utils.py:

```
openfold/utils/script_utils.py:153: SyntaxWarning: invalid escape sequence '\W'
  tags = [re.split('\W| \|', t)[0] for t in tags]
```

I believe this is the fix:

```
  tags = [re.split(r'\W| \|', t)[0] for t in tags]
```
