Use callback for countdown reset

[gromchen]

Otherwise, it's a potential infinite loop in useEffect.

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Latest commit: 22e72b4e1b151d98f1f2995435589208ece74da1

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[juliencrn]

Hi @gromchen,

Thanks for that PR, since the code is too old, I re-created it there (#526). I added you to the contributor list.