[IMGUI] Icons of the bounding volume editor tool is distorted

The icons of the “bounding volume editor Tool” and “Edit bounding volume ” are distorted (blurred). Edit bounding volume icon can be seen under the Edit box collider option.

Steps to Repro:
1. Create a new Project
2. Observe the bounding volume editor tool icon is distorted.
3. Create Cube > select cube > Editor Tool > Edit box collider
4. Observe The icon of the Edit bounding volume is blurred.

Expected Result: Icon should not be distorted

Actual Result: The icon is distorted (blurred)

Reproducible in: 2021.2.0a3, 2021.1.0b4, 2021.1.0a1
Working fine on: 2020.2.2f1, 2020.1.17f1, 2019.4.19f1

Environment: Windows, Mac, and Ubuntu