Fix codegen to allow add_sticker_to_set fn to work correctly

crates/teloxide-core/src/payloads/add_sticker_to_set.rs

@@ -15,7 +15,6 @@ impl_payload! {
             /// Sticker set name
             pub name: String [into],
             /// A JSON-serialized object with information about the added sticker. If exactly the same sticker had already been added to the set, then the set isn't changed.
-            #[serde(flatten)]
             pub sticker: InputSticker,
         }
     }

crates/teloxide-core/src/payloads/codegen.rs

@@ -219,10 +219,7 @@ fn params(params: impl Iterator<Item = impl Borrow<Param>>) -> String {
                      \"crate::types::serialize_reply_to_message_id\")]"
                 }
                 Type::RawTy(s)
-                    if s == "MessageId"
-                        || s == "InputSticker"
-                        || s == "TargetMessage"
-                        || s == "StickerType" =>
+                    if s == "MessageId" || s == "TargetMessage" || s == "StickerType" =>
                 {
                     "\n            #[serde(flatten)]"
                 }