fix: move DifferentialDiffusion node inside Seam Fix group

Node 24 was at y=60, above Group 5's boundary (y=130). Moved to
y=140 so it's correctly inside the group and gets muted when the
user bypasses the Seam Fix pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

example_workflows/tiled-upscale-builtin-nodes.json

@@ -412,7 +412,7 @@
     {
       "id": 24,
       "type": "DifferentialDiffusion",
-      "pos": [2560, 60],
+      "pos": [2560, 140],
       "size": [250, 46],
       "flags": {},
       "order": 12,