[bugfix/Refactor] Config Page: Device Tab. Fix render error when open config page before preparing backend.

And remove the code that is no longer in use.

src-ui/store.js

@@ -6,7 +6,6 @@ import {
 
 import {
     translator_list,
-    test_device_list,
     generateTestData,
     word_filter_list,
 } from "@data";