fix: remove leftover _ensure_telegram_credentials() call causing RUNTIME_ERROR

The method was removed earlier but a call at line 206 remained,
causing AttributeError on startup when dataset has existing data.

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

scripts/sync_hf.py

@@ -203,7 +203,6 @@ class OpenClawFullSync:
 
         # Patch config after restore
         self._patch_config()
-        self._ensure_telegram_credentials()
         self._debug_list_files()
 
     # ── Save (periodic + shutdown) ─────────────────────────────────────