Search options no longer highlight as cursor moves.

[sjuxax]

Describe the bug
Search options no longer highlight as one scrolls through the options, making it hard to know what/where you're typing.

To Reproduce
Steps to reproduce the behavior:

1. Open the find tool with f
2. Try to change some options, notice it works, but no longer highlights.

Expected behavior

1. Open the find tool with f
2. See where your cursor is so you can toggle options.

Screenshots
If applicable, add screenshots to help explain your problem.

Screencast_20260720_191003.webm

Context (please complete the following information):

• OS/Distro + Version: Arch Linux
• GitUI Version 0.28.1
• Rust version: 1.97.1