opt download (#1755)

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models_new/download/download_info.dart

@@ -1,6 +1,8 @@
 import 'package:PiliPlus/models_new/download/bili_download_entry_info.dart';
+import 'package:PiliPlus/pages/common/multi_select/base.dart'
+    show MultiSelectData;
 
-class DownloadPageInfo {
+class DownloadPageInfo with MultiSelectData {
   final String pageId;
   final String dirPath;
   final String title;
@@ -8,7 +10,6 @@ class DownloadPageInfo {
   int sortKey;
   final int? seasonType;
   final List<BiliDownloadEntryInfo> entrys;
-  BiliDownloadEntryInfo? entry;
 
   DownloadPageInfo({
     required this.pageId,
@@ -18,6 +19,5 @@ class DownloadPageInfo {
     required this.sortKey,
     this.seasonType,
     required this.entrys,
-    this.entry,
   });
 }