fix: 缓存清除提示错误

lib/pages/about/index.dart

@@ -164,11 +164,8 @@ class _AboutPageState extends State<AboutPage> {
           ),
           ListTile(
             onTap: () async {
-              var cleanStatus = await CacheManage().clearCacheAll();
-              if (cleanStatus) {
-                getCacheSize();
-                SmartDialog.showToast('清除成功');
-              }
+              await CacheManage().clearCacheAll();
+              getCacheSize();
             },
             title: const Text('清除缓存'),
             subtitle: Text('图片及网络缓存 $cacheSize', style: subTitleStyle),

lib/utils/cache_manage.dart

@@ -101,7 +101,7 @@ class CacheManage {
                   await clearLibraryCache();
                   Timer(const Duration(milliseconds: 500), () {
                     SmartDialog.dismiss().then((res) {
-                      SmartDialog.showToast('清除完成');
+                      SmartDialog.showToast('清除成功');
                     });
                   });
                 } catch (err) {