`StockClosing.get_sle_entries` filtered `Stock Closing Balance` by a
`closing_stock_balance` column that does not exist; the link field back to
the closing entry is `stock_closing_entry`. As a result every Stock
Closing Entry created after the first one failed with
`OperationalError (1054, "Unknown column 'closing_stock_balance'")`, since
the previous-balance branch only runs once an earlier closing exists.
Fixes#54819
(cherry picked from commit 8e627db785)
# Conflicts:
# erpnext/stock/doctype/stock_closing_entry/test_stock_closing_entry.py
b9d2f7d7ba