fix: show invoices name instead of object address

comma_and function in expecting a list but it gets a tuple so it is returning a object instead of a string

(cherry picked from commit cf93714)

erpnext/accounts/doctype/payment_entry/payment_entry.py

@@ -468,7 +468,7 @@ def validate_paid_invoices(self):
 				_(
 					"References {0} of type {1} had no outstanding amount left before submitting the Payment Entry. Now they have a negative outstanding amount."
 				).format(
-					frappe.bold(comma_and((d.reference_name for d in references))),
+					frappe.bold(comma_and([d.reference_name for d in references])),
 					_(reference_doctype),
 				)
 				+ "<br><br>"