PLE1307: false positive

PLE1307: false positive:
```python
$ cat x.py
print('[%c]' % ('x',))
print('[%c]' % 'x')
$ ruff x.py
x.py:1:7: PLE1307 Format type does not match argument type
x.py:2:7: PLE1307 Format type does not match argument type
Found 2 errors.
```