Apply doc filtering in admin to costs & goods

As it was already the case for services.

costs/admin.py

@@ -164,9 +164,9 @@ class ServiceAdmin(admin.ModelAdmin):
 
 @admin.register(Good)
 class GoodAdmin(admin.ModelAdmin):
-    pass
+    list_filter = [DirectDocumentFilter]
 
 
 @admin.register(Cost)
 class CostAdmin(admin.ModelAdmin):
-    pass
+    list_filter = [DirectDocumentFilter]