fix syntax error

Author: priyakasimbeg

algorithmic_efficiency/workloads/librispeech_deepspeech/librispeech_jax/workload.py

@@ -56,7 +56,7 @@ def init_model_fn(
     params = jax_utils.replicate(params)
     return params, model_state
 
-   def model_fn(
+  def model_fn(
       self,
       params: spec.ParameterContainer,
       augmented_and_preprocessed_input_batch: Dict[str, spec.Tensor],