fix: use VIT-G preset for SDXL IP-Adapter workflows

Changed from PLUS/PLUS FACE presets to VIT-G preset because:
- VIT-G preset is specifically designed for SDXL models
- It correctly maps to the ViT-bigG CLIP Vision model
- PLUS presets default to SD1.5 CLIP Vision models

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

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

comfyui/workflows/image-to-image/ipadapter-composition-i2i-production-v1.json

@@ -138,7 +138,7 @@
         100
       ],
       "widgets_values": [
-        "PLUS (high strength)"
+        "VIT-G (medium strength)"
       ],
       "title": "IP-Adapter Loader 1",
       "flags": {},
@@ -185,7 +185,7 @@
         250
       ],
       "widgets_values": [
-        "PLUS (high strength)"
+        "VIT-G (medium strength)"
       ],
       "title": "IP-Adapter Loader 2",
       "flags": {},

comfyui/workflows/image-to-image/ipadapter-face-i2i-production-v1.json

@@ -102,7 +102,7 @@
         "1": 78
       },
       "widgets_values": [
-        "PLUS FACE (portraits)"
+        "VIT-G (medium strength)"
       ],
       "title": "IP-Adapter Face Loader",
       "flags": {},