Underscores are not displayed in the search and replace window

- NotepadNext-Windows-Qt6.4.2 3141350

![image](https://user-images.githubusercontent.com/5158738/229393293-e89c4e97-5e20-4036-a5e1-a9057b1d6280.png)
![image](https://user-images.githubusercontent.com/5158738/229393318-4e08069d-0544-4095-b132-a1bb51a96417.png)
