Match client settings fixture to desktop contract

Author: Marve10s

apps/desktop/src/clientPersistence.test.ts

@@ -54,7 +54,6 @@ const clientSettings: ClientSettings = {
   diffWordWrap: true,
   sidebarProjectSortOrder: "manual",
   sidebarThreadSortOrder: "created_at",
-  sidebarThreadPreviewCount: 6,
   timestampFormat: "24-hour",
 };