Fixed Wav2Vec2ProcessorWithLM decoding error (#31188)
* fix: wav2vec2_with_lm decoding error
Fixed an error where some language models could
not be loaded due to a decoding error, since it
was impossible to select the 'unigram_encoding'
value.
* fix: unexpected keyword argument
Fixed unexpected keyword argument caused by
passing kwargs directly to BeamSearchDecoderCTC.
* style: wav2vec2_with_lm
Changed single quotes to double quotes.