fix: update AnimateDiff workflow to use correct checkpoint filename

Change CheckpointLoaderSimple to use 'sd_xl_base_1.0.safetensors' instead of
'diffusers/stable-diffusion-xl-base-1.0' to match the actual checkpoint file
linked in /root/ComfyUI/models/checkpoints/

models/comfyui/workflows/advanced/animatediff-video-production-v1.json

@@ -11,7 +11,7 @@
       "order": 0,
       "mode": 0,
       "properties": {"Node name for S&R": "CheckpointLoaderSimple"},
-      "widgets_values": ["diffusers/stable-diffusion-xl-base-1.0"],
+      "widgets_values": ["sd_xl_base_1.0.safetensors"],
       "title": "SDXL Checkpoint Loader",
       "outputs": [
         {"name": "MODEL", "type": "MODEL", "links": [1], "slot_index": 0},