Fix hybrid transcribe

[ArtyomZemlyak]

What does this PR do ?

Fix transribe function in EncDecHybridRNNTCTCModel.

Collection: [Note which collection this PR will affect]
ASR

Changelog

• Add variables for transcribe invocation if use_rnnt_decoder.
• Change name of variable (logits_len to encoded_len).
• Change ErrorValue to ValueError in change_decoding_strategy of EncDecHybridRNNTCTCBPEModel.

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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Additional Information

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[VahidooX]

Thanks for fixing the bug!

[VahidooX]

LGTM!