Fix add extruder function

CURA-4868

cura/Settings/CuraContainerRegistry.py

@@ -542,9 +542,10 @@ class CuraContainerRegistry(ContainerRegistry):
         user_container = InstanceContainer(user_container_id)
         user_container.setName(user_container_name)
         user_container.addMetaDataEntry("type", "user")
-        user_container.addMetaDataEntry("machine", extruder_stack.getId())
+        user_container.addMetaDataEntry("machine", machine.Id())
         user_container.addMetaDataEntry("setting_version", CuraApplication.SettingVersion)
         user_container.setDefinition(machine.definition.getId())
+        user_container.setMetaDataEntry("extruder", extruder_stack.getId())
 
         if machine.userChanges:
             # for the newly created extruder stack, we need to move all "per-extruder" settings to the user changes