Input-field of Source Game Object property is misaligned as compared to other input fields, Refer attached Screenshot.

Steps to reproduce:
1. Create a new project
2. Window > Package Manager > Timeline(preview.7 - 1.3.0) > Install
3. Window > Sequencing > Timeline
4. Create a Playable Director and Timeline Asset for Cube
5. Create Control Track and add Control Clip from GameObject
6. Inspector > Control Playable Asset

Actual Result:
Source Game Object Input-field is misaligned

Expected Result:
Source Game Object Input-field should align with other input fields

Tested on Unity version:
2020.1.0a25, 2019.3.2f1, 2019.3.0a1

Package version occurring: preview.7 - 1.3.0, 1.2.12, 1.2.6

Environment:
Windows 10 and macOS 10.14