fix(payments-next): Fix update button for Link as saved method Because:
commit 537d04872c177ea56c9d398e1e984ba5a21087ac Author: Davey AlvarezDate: Tue Jan 6 18:20:41 2026 -0800 fix(payments-next): Fix update button for Link as saved method Because: * When the user had Link as their saved payment method, the Manage Payment Methods page would show the option to update/save their payment method even when no changes had been made This commit: * Fixes the logic that compares the selected vs default payment method states Closes #PAY-3422