Pass Names section closes on closing Filters dropdown.

Steps to repro:
1. Create a new URP Template Project.
2. Project Window > Right Click > Create > Rendering.
3. Universal Render Pipeline > Forward Renderer.
4. Select "CustomForwardRendererData" > Add Renderer Object from the Inspector.
5. Close the Filters dropdown.

Actual Result:
Pass Names section closes on closing Filters dropdown.

Expected Result:
Pass Names section should not close on closing Filters dropdown.

Reproducible in:
2021.1.0a9, 2020.2.0f1, 2020.1.0f1, 2020.1.0b13 with 10.2.1, 10.2.0, 10.1.0, 9.0.0-preview.35

Note: Pass Names drop-down added in 9.0.0-preview.35.

Environment:
Occurring on Windows 10 & Mac 10.15.