[fix] give preference to gateway selected on shopping cart settings (#11393)

diff --git a/erpnext/accounts/doctype/payment_request/payment_request.py b/erpnext/accounts/doctype/payment_request/payment_request.py
index 807ad28..21ddb10 100644
--- a/erpnext/accounts/doctype/payment_request/payment_request.py
+++ b/erpnext/accounts/doctype/payment_request/payment_request.py
@@ -294,7 +294,7 @@
 	if args.get("payment_gateway"):
 		return get_payment_gateway_account(args.get("payment_gateway"))
 
-	if args.cart:
+	if args.order_type == "Shopping Cart":
 		payment_gateway_account = frappe.get_doc("Shopping Cart Settings").payment_gateway_account
 		return get_payment_gateway_account(payment_gateway_account)