opt: non null (#1091)

* opt: type

* opt: type 2

* opt: type 3

lib/common/widgets/image/image_save.dart

@@ -10,7 +10,7 @@ import 'package:get/get.dart';
 void imageSaveDialog({
   required String? title,
   required String? cover,
-  dynamic aid,
+  Object? aid,
   String? bvid,
 }) {
   final double imgWidth = Get.mediaQuery.size.shortestSide - 8 * 2;