"Default" and "Center" options text overlaps with a dropdown icon in the "HD Scene Color" node, refer the attached screenshot

Steps to repro:
1. Create a new project
2. Windows > Package Manager > Shader Graph(7.1.7) > Install
3. Project > Create > Shader > PBR Graph > Open
4. Create the "HD Scene Color" Node
5. Select "Default" OR "Center" options from the dropdown

Actual Result:
"Default" and "Center" options text overlaps with a dropdown icon

Expected Result:
"Default" and "Center" options text visible clearly

Reproducible in:
2020.1.0a18, 2019.3.0f5, 2019.3.0b2

Working Fine in:
2019.3.0b1, 2019.2.13f1

Package found version: 7.1.7, 7.1.6, 7.1.1, 7.0.1

Environment:
Windows 10 & macOS 10.14