test: set opening stock to fix NegativeStock errors (#25101)

Co-authored-by: Sagar Vora <sagar@resilient.tech>
diff --git a/erpnext/stock/doctype/item/test_records.json b/erpnext/stock/doctype/item/test_records.json
index 909c4ee..c1f20a4 100644
--- a/erpnext/stock/doctype/item/test_records.json
+++ b/erpnext/stock/doctype/item/test_records.json
@@ -12,6 +12,7 @@
   "item_name": "_Test Item",
   "apply_warehouse_wise_reorder_level": 1,
   "gst_hsn_code": "999800",
+  "opening_stock": 10,
   "valuation_rate": 100,
   "item_defaults": [{
     "company": "_Test Company",