fix: pos invoice status not updating on cancel (backport #47556) (#47657)

fix: pos invoice status not updating on cancel (#47556)

(cherry picked from commit 8c86def018)

Co-authored-by: Diptanil Saha <diptanil@frappe.io>

erpnext/accounts/doctype/pos_invoice/pos_invoice.py

@@ -273,6 +273,8 @@ class POSInvoice(SalesInvoice):
 			against_psi_doc.delete_loyalty_point_entry()
 			against_psi_doc.make_loyalty_point_entry()
 
+		self.db_set("status", "Cancelled")
+
 		if self.coupon_code:
 			from erpnext.accounts.doctype.pricing_rule.utils import update_coupon_code_count