refactor: use payment's CC for gain/loss if company default is unset

(cherry picked from commit d6a3b9a5c7)

# Conflicts:
#	erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py

erpnext/controllers/accounts_controller.py

@@ -1087,6 +1087,7 @@ class AccountsController(TransactionBase):
 									self.doctype,
 									self.name,
 									arg.get("referenced_row"),
+									arg.get("cost_center"),
 								)
 								frappe.msgprint(
 									_("Exchange Gain/Loss amount has been booked through {0}").format(
@@ -1165,6 +1166,7 @@ class AccountsController(TransactionBase):
 							self.doctype,
 							self.name,
 							d.idx,
+							self.cost_center,
 						)
 						frappe.msgprint(
 							_("Exchange Gain/Loss amount has been booked through {0}").format(