Fix template typo

Author: huydhn

extension/benchmark/android/benchmark/android-llm-device-farm-test-spec.yml.j2

@@ -9,7 +9,7 @@ phases:
   pre_test:
     commands:
       # Print this so that the upload script can read and process the benchmark config
-      echo "The benchmark config is {{ benchmark_config_id }}"
+      - echo "The benchmark config is {{ benchmark_config_id }}"
 
       # Download the model from S3
       - curl -s --fail '{{ model_path }}' -o model.zip