Fix duplicate sidebar thread preview count in desktop test

Author: Marve10s

apps/desktop/src/clientPersistence.test.ts

@@ -55,7 +55,6 @@ const clientSettings: ClientSettings = {
   sidebarProjectSortOrder: "manual",
   sidebarThreadPreviewCount: 6,
   sidebarThreadSortOrder: "created_at",
-  sidebarThreadPreviewCount: 6,
   timestampFormat: "24-hour",
 };