Threshold volumes decibel(dB) text is clipped on dragging the slider in AudioMixer.

Steps to repro:
1. Create a new project.
2. Windows > Audio > Audio Mixer.
3. Add Audio Mixer > Select newly created AudioMixer asset.
4. Change the Threshold volume value using the slider.

Actual Result:
Threshold volume value is clipped.

Expected Result:
Threshold volume value is not clipped

Reproducible in:
2020.1.0a2, 2019.3.0b1, 2019.2.0f1.

Environment:
Only on Windows.