Inconsistent folder icon used in Search Index Manager "Roots" section

Steps to reproduce:

1.  Create a new Unity Project
2.  Open the Search Index Manager window at (menu: Window > Search > Index Manager)
3.  Expand the "Roots"
4. Observe the folder icon and compare it with standard folder icons used elsewhere in the Unity Editor

Actual results: The folder icon in the "Roots" section appears visually inconsistent with the rest of the Unity Editor icons

Expected results: The folder icon match the standard design used throughout the Editor for visual consistency

Reproducible with versions: 2022.3.61f1, 6000.0.50f1, 6000.1.8f1, 6000.2.0b4

Tested on (OS): macOS 15.5