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What's in this Pull Request?
Right now user cannot clean up the choice field (the issue only occurs on single choice, multiple choice doesn't have this problem) in Dynamic Form.
This hotfix will allow user remove the selected choice.
demo on optional field:

demo on required field:
I created a new child control under dynamic field folder to implement this clean up functionality.
Please feel free to let me know if I need modify something (UI, Naming...).