fix(file system watcher): 修复文件索引关闭再打开后丢失监听的问题

文件监听在关闭后没哟正确清空所有缓存，导致再次重新开启监听后不能正确添加监听

libsearch/filesystemwatcher/file-system-watcher.cpp

@@ -145,6 +145,7 @@ void FileSystemWatcherPrivate::clearAll()
         m_notifier = nullptr;
     }
     m_watchPathHash.clear();
+    m_watchedRootPaths.clear();
     init();
 }