Fix incorrect attention mask truncate in WhisperFlashAttention2 (#36477)
* Fix incorrect attention mask truncate in whisper flash attention
* also fix incorrect attention mask truncate in qwen2 audio
* Nit attention mask truncate modeling_qwen2_audio.py
* Nit attention mask truncate modeling_whisper.py
Co-authored-by: Anton Vlasjuk <73884904+vasqu@users.noreply.github.com>
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Co-authored-by: Anton Vlasjuk <73884904+vasqu@users.noreply.github.com>
Co-authored-by: eustlb <94853470+eustlb@users.noreply.github.com>