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

Bug: twpowertools:176
Change-Id: I7a24fb504ce53697112f11128d2d5249a5a7c7e7
diff --git a/src/injections/litComponentsInject.js b/src/injections/litComponentsInject.js
index ce8ace8..7143bd5 100644
--- a/src/injections/litComponentsInject.js
+++ b/src/injections/litComponentsInject.js
@@ -4,7 +4,7 @@
 // because `window.customElements` doesn't exist in content scripts.
 import '../features/workflows/core/communityConsole/components/index.js';
 import '../contentScripts/communityConsole/threadToolbar/components/index.js';
-import '../contentScripts/communityConsole/flattenThreads/components/index.js';
+import '../features/flattenThreads/core/components/index.js';
 import '../contentScripts/communityConsole/updateHandler/banner/components/index.js';
 
 import {injectStylesheet} from '../common/contentScriptsUtils';