fix eval_beamsearch_ngram_ctc script

[lilithgrigoryan]

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What does this PR do ?

Fix of eval_beamsearch_ngram_ctc script mentioned here #13064.

Collection: ASR

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[github-actions]

[🤖]: Hi @lilithgrigoryan 👋,

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.

//cc @chtruong814 @ko3n1g @pablo-garay @thomasdhc

[nithinraok]

LGTM