[pipeline] fix Whisper test

[sanchit-gandhi]

What does this PR do?

Fixes Whisper pipeline test.

Previously, we suppressed the hyphen and apostrophe tokens from Whisper generation, meaning they were alway predicted with zero probability. This meant that these tokens could never be predicted. With the Hub PR https://huggingface.co/openai/whisper-large/discussions/12, these tokens were removed from the set of suppressed tokens, meaning they can now (correctly) be predicted with non-zero probability.

We get the correct contraction now in the Italian prediction: "allo universo" -> "all'universo"

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[sanchit-gandhi]

Test already fixed in #20588