remove image_id field from ImageAdmin
diff --git a/planetstack/core/admin.py b/planetstack/core/admin.py
index 4e19c36..6a8341b 100644
--- a/planetstack/core/admin.py
+++ b/planetstack/core/admin.py
@@ -726,7 +726,7 @@
 
     inlines = [SliverInline]
     
-    user_readonly_fields = ['image_id', 'name', 'disk_format', 'container_format']
+    user_readonly_fields = ['name', 'disk_format', 'container_format']
     user_readonly_inlines = [SliverROInline]
     
 class NodeForm(forms.ModelForm):