Improve lazy-highlight

This PR makes the font weight of `lazy-highlight`consistent with the other faces when default font is set not to `normal`. before: <img width="510" alt="Screen Shot 2024-07-15 at 2 09 58 PM" src="https://github.com/user-attachments/assets/1b5d694c-6986-4b6b-a2f8-4b53cb935852"> after: <img width="518" alt="Screen Shot 2024-07-15 at 2 10 56 PM" src="https://github.com/user-attachments/assets/0cf0cf85-6c33-4da2-a74d-23d510625aa0">