- fix bug: Files filter by keyword "document" will match all folders
- change BackHandler logic: press back button when filter and selection mode both are enabled, will quit selection first
- 修复文件管理器过滤关键字为"document"时将匹配所有文件夹的bug
- 修改返回键处理逻辑:当过滤模式和选择模式同时开启时,按返回键先退出选择模式