Swap field order: send order and id

Changed between draft-03 and draft-04

- https://www.ietf.org/archive/id/draft-ietf-moq-transport-03.html#section-6.3.2-2
- https://www.ietf.org/archive/id/draft-ietf-moq-transport-04.html#section-6.11.2-2

moq-transport/src/data/object.rs

@@ -11,11 +11,11 @@ pub struct ObjectHeader {
 	// The sequence number within the track.
 	pub group_id: u64,
 
-	// The sequence number within the group.
-	pub object_id: u64,
-
 	// The send order, where **smaller** values are sent first.
 	pub send_order: u64,
+
+	// The sequence number within the group.
+	pub object_id: u64,
 }
 
 impl Decode for ObjectHeader {
@@ -24,8 +24,8 @@ impl Decode for ObjectHeader {
 			subscribe_id: u64::decode(r)?,
 			track_alias: u64::decode(r)?,
 			group_id: u64::decode(r)?,
-			object_id: u64::decode(r)?,
 			send_order: u64::decode(r)?,
+			object_id: u64::decode(r)?,
 		})
 	}
 }
@@ -35,8 +35,8 @@ impl Encode for ObjectHeader {
 		self.subscribe_id.encode(w)?;
 		self.track_alias.encode(w)?;
 		self.group_id.encode(w)?;
-		self.object_id.encode(w)?;
 		self.send_order.encode(w)?;
+		self.object_id.encode(w)?;
 
 		Ok(())
 	}