Remove pretrained_path (internal cluster path; unused at load time)

config.json

@@ -49,7 +49,6 @@
     "private": null,
     "tags": null,
     "license": null,
-    "pretrained_path": "/lustre/fsw/portfolios/nvr/projects/nvr_elm_llm/users/zekail/models/flashvla_action_unified_clean_random_fsdp_bf16_bs32_100k/checkpoints/last/pretrained_model",
     "attention_backend": "sdpa",
     "paligemma_variant": "gemma_2b",
     "action_expert_variant": "gemma_300m",