sctfw004: link OrcaSlicer user presets into the flatpak config dir

The flatpak reads ~/.var/app/com.orcaslicer.OrcaSlicer/config/OrcaSlicer,
so the ~/.config/OrcaSlicer link was unused.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

meta/hosts/sctfw004.conf.yaml

@@ -31,7 +31,7 @@
     ~/.config/inkscape:               common/inkscape
     ~/.config/FreeCAD:                common/FreeCAD
     ~/.config/cura:                   common/cura
-    ~/.config/OrcaSlicer:             common/OrcaSlicer
+    ~/.var/app/com.orcaslicer.OrcaSlicer/config/OrcaSlicer/user: common/OrcaSlicer/user
     ~/.config/LightBurn:              common/LightBurn
     ~/.config/obs-studio:             common/obs-studio
     ~/.config/gtk-3.0:               hosts/sctfw004/config/gtk-3.0