Remove deprecated inference config fields from neuron_snemi

Remove keep_input_on_cpu and distributed_sharding fields that were
removed in the inference config schema cleanup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Donglai Wei

tutorials/neuron_snemi.yaml

@@ -27,10 +27,8 @@ default:
     sliding_window:
       window_size: [16, 224, 224]
       sw_batch_size: 4
-      keep_input_on_cpu: true
     test_time_augmentation:
       enabled: true
-      distributed_sharding: true
       flip_axes: all
     postprocessing:
       enabled: true