fix daphne deployment

one_trip/lib/api/models/simpleuser.dart

@@ -29,12 +29,15 @@ class SimpleUser {
   });
 
   factory SimpleUser.fromJson(Map<String, dynamic> json) {
+    String? imagePath = json["image"] as String?;
+    String? imageUrl = imagePath != null ? "$baseURL/media/$imagePath" : null;
+
     return SimpleUser(
       id: json["id"] as int,
       username: json["username"] as String,
       firstName: json["first_name"] as String,
       lastName: json["last_name"] as String,
-      imageUrl: json["image"] as String?,
+      imageUrl: imageUrl,
     );
   }