Fixes for Canary adapters tutorial

[pzelasko]

What does this PR do ?

Update prompt format fn usage in Multi-task ASR adapter tutorial

Collection: ASR

Changelog

• Update prompt format fn usage in Multi-task ASR adapter tutorial

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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Additional Information

• Related to # (issue)

[pzelasko]

I don't know why the diff is so big - I did the following:

• removed the inference argument in prompt format fn / data module
• updated the custom dataset class to return a dataclass as minibatch, same as the default prompted dataset
• re-ran the whole notebook.

[nithinraok]

LGTM, Thanks

[github-actions]

[🤖]: Hi @pzelasko 👋,

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