Fix: Skip FERRERO.MASTERASSETIDS field on PROD - field not yet configured

PROD DAM rejects FERRERO.MASTERASSETIDS as it only exists in PPR. Remove the
single-master-to-list conversion so PROD uses the existing single-ID field
(master_opentext_id) instead. Will be re-added when client configures the
tabular field in PROD.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Python-Version/scripts/a2_to_a3_upload_polling.py

@@ -124,8 +124,6 @@ def process_box_file(file_info, dam, box, db, parser, mvp_extractor, config, not
             if not master_asset:
                 # Will check below
                 master_asset = None
-            else:
-                master_opentext_ids = [master_asset['opentext_id']]
 
         # CHECK: Warn if Master Tracking ID is used (starts with uppercase M)
         if tracking_id.startswith('M'):