`RUF001` isn't highlighted for implicitly concatenated f-string

Given:

```python
x = '𝐁ad' f'𝐁ad string'
#           ^
#           Ruff only highlights this
```

Ruff only highlights the bad character from the second part of the implicitly concatenated string.

https://play.ruff.rs/16071c4c-a1dd-4920-b56f-e2ce2f69c843