clean up models

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

lib/models_new/later/stat.dart

@@ -1,16 +1,13 @@
 class Stat {
-  int? aid;
   int? view;
   int? danmaku;
 
   Stat({
-    this.aid,
     this.view,
     this.danmaku,
   });
 
   factory Stat.fromJson(Map<String, dynamic> json) => Stat(
-    aid: json['aid'] as int?,
     view: json['view'] as int?,
     danmaku: json['danmaku'] as int?,
   );