copy Whisper generate_with_fallback kwargs
Author: udeepam
Pull request: yes

# What does this PR do?

The Whisper longform audio decoding strategy (from the paper) is for each audio segment:
1. Beam search with beam_size=5 using log probabilities as the scoring function. 
     - `GenerationMode.BEAM_SEARCH`
2. If average log probability over the generated tokens is lower than -1 or the generated text has a gzip compression rate higher than 2.4:
     - Fallback to sampling with temperature increased by 0.2 up to 1.0
     - `GenerationMode.SAMPLE`

However because the `kwargs` to `generate_with_fallback()` are not copied, if on the first audio segment we fallback the `num_beams` parameter in the `kwargs` get removed. 
https://github.com/huggingface/transformers/blob/1681a6d452b60ff3652a96f03541dfa491124192/src/transformers/models/whisper/generation_whisper.py#L777
Hence for the second audio segment we start with `GenerationMode.SAMPLE` instead of `GenerationMode.BEAM_SEARCH`.

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## Who can review?

@sanchit-gandhi

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Comments:
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I think this was fixed by #29225

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

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