If the original return was filed when taxes were charged against the first $10,200 of unemployment, and nothing else changed for this amended return, then yes, you will receive a refund due to the change in the tax law.
However, the IRS will automatically calculate the adjustment for you. The IRS has requested people to not ament in this case.
For more information, see: New Exclusion of up to $10,200 of Unemployment Compensation | Internal Revenue Service
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