Masquer la case description HTML de l'admin des coûts

fix #9

costs/admin.py

@@ -167,8 +167,10 @@ class ServiceAdmin(admin.ModelAdmin):
 @admin.register(Good)
 class GoodAdmin(admin.ModelAdmin):
     list_filter = [DirectDocumentFilter]
+    exclude = ['description_html']
 
 
 @admin.register(Cost)
 class CostAdmin(admin.ModelAdmin):
     list_filter = [DirectDocumentFilter]
+    exclude = ['description_html']