This PR fixes a bug where the select first didn't select the first
visual entry when the first entry is a collapsed directory.

Follow-up: https://github.com/zed-industries/zed/pull/45030

**Before**:


https://github.com/user-attachments/assets/5e5865cc-ec0f-471d-a81b-9521fb70df41

**After**:


https://github.com/user-attachments/assets/05562572-e43f-4d1e-9638-80e4dccc0998

Release Notes:

- git_ui: Fix select first entry selects the wrong visual first entry
when tree view is enabled