Update `WhisperForAudioClassification` doc example
# What does this PR do?

After the config file change in Hub commit `a7a63ecc2bd1015783dead844fced2af7531edd2` on `sanchit-gandhi/whisper-medium-fleurs-lang-id`, the doc example for `WhisperForAudioClassification` has to be updated.

Currently the test fails  due to a different expected output value.
_The documentation is not available anymore as the PR was closed or merged._