fix: sc object not loaded (#19892)

fix for object not loaded and errors in auto-generate :

Traceback (most recent call last):
  File "/home/frappe/frappe-bench/apps/frappe/frappe/utils/background_jobs.py", line 103, in execute_job
    method(**kwargs)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/buying/doctype/supplier_scorecard/supplier_scorecard.py", line 141, in refresh_scorecards
    sc.save()
TypeError: 'NoneType' object is not callable

erpnext/buying/doctype/supplier_scorecard/supplier_scorecard.py

@@ -138,7 +138,7 @@ def refresh_scorecards():
 		# Check to see if any new scorecard periods are created
 		if make_all_scorecards(sc.name) > 0:
 			# Save the scorecard to update the score and standings
-			sc.save()
+			frappe.get_doc('Supplier Scorecard', sc.name).save()
 
 
 @frappe.whitelist()