Use a different color for ignored files in the project panel (#4227)

Max Brunsfeld created

![Screenshot 2024-01-23 at 1 03
01 PM](https://github.com/zed-industries/zed/assets/326587/28b4e7e1-8847-40ff-aed6-0f4ede6b9007)


Release Notes:

- Fixed an issue where ignored files were not visually distinguished in
the project panel.

Change summary

crates/project_panel/src/project_panel.rs | 2 ++
1 file changed, 2 insertions(+)

Detailed changes