Removed unused imports and moved tour bloc to delivery to be shared by overview and detailed view

lib/dto/discount_update_response.dart

@@ -1,4 +1,3 @@
-import 'package:hl_lieferservice/dto/article.dart';
 
 import 'basic_response.dart';
 import 'discount_add_response.dart';
@@ -18,5 +17,6 @@ class DiscountUpdateResponseDTO extends BasicResponseDTO {
   factory DiscountUpdateResponseDTO.fromJson(Map<String, dynamic> json) =>
       _$DiscountUpdateResponseDTOFromJson(json);
 
+  @override
   Map<dynamic, dynamic> toJson() => _$DiscountUpdateResponseDTOToJson(this);
 }