fix: correct VHS_VideoCombine parameters for SVD workflow

Remove format-specific parameters from widgets_values array.
Only base parameters should be in widgets_values:
- frame_rate, loop_count, filename_prefix, format, pingpong, save_output

Format-specific params (pix_fmt, crf) are added dynamically by ComfyUI.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

comfyui/workflows/image-to-video/svd-i2v-production-v1.json

@@ -226,7 +226,7 @@
       "type": "VHS_VideoCombine",
       "pos": [1400, 100],
       "size": [315, 200],
-      "widgets_values": [6, 0, "svd_output", "video/h264-mp4", "yuv420p", 19, true, false],
+      "widgets_values": [6, 0, "svd_output", "video/h264-mp4", false, true],
       "title": "Combine Video Frames",
       "flags": {},
       "order": 6,