Update ios/extention/Resources/scripts/wiki-data-manager.js

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: kiyarose

ios/extention/Resources/scripts/wiki-data-manager.js

@@ -112,7 +112,7 @@ let _wikiIndexPromise = null
 
 /** Ensure the in-memory lookup index is built. */
 function ensureIndex () {
-  if (_wikiIndex !== null) return _wikiIndex
+  if (_wikiIndex !== null) return Promise.resolve(_wikiIndex)
   if (_wikiIndexPromise) return _wikiIndexPromise
   _wikiIndexPromise = getWikiData().then(data => {
     _wikiIndex = buildIndex(data)