refactor(flatten-threads): migrate to the new DI architecture

Bug: twpowertools:176
Change-Id: I7a24fb504ce53697112f11128d2d5249a5a7c7e7
diff --git a/src/xhrInterceptor/responseModifiers/flattenThread.js b/src/xhrInterceptor/responseModifiers/flattenThread.js
index 2eac64d..452b1fb 100644
--- a/src/xhrInterceptor/responseModifiers/flattenThread.js
+++ b/src/xhrInterceptor/responseModifiers/flattenThread.js
@@ -1,4 +1,4 @@
-import {kAdditionalInfoClass} from '../../contentScripts/communityConsole/flattenThreads/flattenThreads.js';
+import {kAdditionalInfoClass} from '../../features/flattenThreads/core/flattenThreads.js';
 import GapModel from '../../models/Gap.js';
 import MessageModel from '../../models/Message.js';
 import StartupDataModel from '../../models/StartupData.js';