fix: missing assign item's expense_account

As in dict object "ret", missing assign item's expense_account will cause it then fetches the default stock_adjustment_account in 'Company'.

erpnext/stock/doctype/stock_entry/stock_entry.py

@@ -757,7 +757,8 @@ class StockEntry(StockController):
 			'serial_no'				: '',
 			'has_serial_no'			: item.has_serial_no,
 			'has_batch_no'			: item.has_batch_no,
-			'sample_quantity'		: item.sample_quantity
+			'sample_quantity'		: item.sample_quantity,
+			'expense_account'		: item.expense_account
 		})
 
 		# update uom