[maeb] wrong class for facebook/wav2vec2-xls-r-2b-21-to-en

[gowitheflow-1998]

looks like this model should be loaded withSpeechEncoderDecoderModel instead of the default Wav2Vec2ForCTC in wav2vec2_models.py. Got errors when running results

[KennethEnevoldsen]

@gowitheflow-1998, this sounds like an easy fix? Feel free to just solve it