Update nucleus/dataset_item.py

Co-authored-by: Sasha Harrison <70984140+sasha-scale@users.noreply.github.com>

Author: drew-kaul

nucleus/dataset_item.py

@@ -161,7 +161,7 @@ def to_payload(self, is_scene=False) -> dict:
         if self.item_id:
             payload[DATASET_ITEM_ID_KEY] = self.item_id
         if self.camera_params:
-            payload[CAMERA_PARAMS_KEY] = self.camera_params
+            payload[CAMERA_PARAMS_KEY] = self.camera_params.to_payload()
 
         return payload