Fix head:all visualization: move to default section where callback reads it

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Donglai Wei

tutorials/neuron_snemi_sdt_multitask.yaml

@@ -78,9 +78,11 @@ default:
       pad_size: [16, 80, 80]
     augmentation:
       profile: aug_em_neuron
+  monitor:
+    logging:
+      images:
+        head: all
   inference:
-    # Decode the short-range affinity head by default. Switch this to another
-    # head when you want to inspect/export it instead.
     head: aff_r1
     sliding_window:
       window_size: [32, 160, 160]
@@ -124,7 +126,6 @@ train:
         loss: [train_loss_total_epoch, train_loss_term_0_weighted, train_loss_term_1_weighted, train_loss_term_2_weighted, train_loss_term_3_weighted]
         loss_every_n_steps: 50
       images:
-        head: all
         log_every_n_epochs: 10
         max_images: 8
         num_slices: 2