Minor fix to nemo1 sequence packing script

[ashors1]

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[cuichenx]

thanks for fixing!

[github-actions]

[🤖]: Hi @ashors1 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g