fix: Map item_code to title (#17403)

When making Project from Sales Order, description was mapped
with Task title which can exceed 140 characters easily.
Description should be mapped with description as it is html field.
diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index fc11e11..fb7a335 100755
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -551,7 +551,7 @@
 		"Sales Order Item": {
 			"doctype": "Project Task",
 			"field_map": {
-				"description": "title",
+				"item_code": "title",
 			},
 		}
 	}, target_doc, postprocess)