bug(cdk/drag-drop): radio input selection resets after dragging element

[alexzuza]

Reproduction

Use StackBlitz to reproduce your issue: https://stackblitz.com/edit/angular-2q94xh

Steps to reproduce:

1. When the page loads, the correct radio input is checked(the third).
2. Reorder the checked item in the list using the [Grab] handle

Expected Behavior

Radio input should preserve original selection

Actual Behavior

Radio input lost selection

Environment

• Angular: 10.0.0
• CDK/Material: 10.1.2
• Browser(s): Chrome 84.0.4147.105

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