fix SpeechRecognitionOutputTransform if local

[flozi00]

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #1362 (0438dad) into master (345c95c) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1362      +/-   ##
==========================================
- Coverage   92.71%   92.69%   -0.02%     
==========================================
  Files         286      286              
  Lines       12814    12814              
==========================================
- Hits        11880    11878       -2     
- Misses        934      936       +2     

Flag	Coverage Δ
unittests	92.69% <ø> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
flash/audio/speech_recognition/model.py	100.00% <ø> (ø)
flash/text/question_answering/collate.py	95.29% <0.00%> (-2.36%)	⬇️

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[ethanwharris]

Awesome, LGTM 😃

[krshrimali]

Thanks, @flozi00 for the PR. LGTM, would you also like adding a brief description of this arg processor_backbone to the docstring of SpeechRecognition class? Here: https://github.com/Lightning-AI/lightning-flash/blob/ba7cb1c3bb7c52197f2cb3aedc36981d00df9e4e/flash/audio/speech_recognition/model.py#L42

If you decide to make another PR for that, that also works. But let's not block this PR for the change, I'll merge this now. 🎉 Thank you for your contribution.