fix unified coupon expiration date

@@ -176,8 +176,9 @@ import AVFoundation
         showBarcodeButtonTopSpace.constant = 0
         // ===
         
-        if let earliestExpiration = coupon?._coupons.min(by: { ($0.expiration ?? "") < ($1.expiration ?? "") }) {
-            expirationLabel.text = "Το κουπόνι ισχύει έως " + (earliestExpiration.expiration ?? "")
+//        if let earliestExpiration = coupon?._coupons.min(by: { ($0.expiration ?? "") < ($1.expiration ?? "") }) {
+        if let latestExpiration = coupon?._coupons.max(by: { ($0.expiration ?? "") < ($1.expiration ?? "") }) {
+            expirationLabel.text = "Το κουπόνι ισχύει έως " + (latestExpiration.expiration ?? "")
         } else {
             expirationLabel.text = ""
         }

@@ -65,8 +65,9 @@ import UIKit
         activeCouponsCount == 1 ? "έχεις " + String(activeCouponsCount) + " ενεργό κουπόνι"
         : "έχεις " + String(activeCouponsCount) + " ενεργά κουπόνια"
         
-        if let earliestExpiration = activeCoupons.min(by: { ($0.expiration ?? "") < ($1.expiration ?? "") }) {
-            expirationLabel.text = "Ισχύει έως " + (earliestExpiration.expiration ?? "")
+//        if let earliestExpiration = activeCoupons.min(by: { ($0.expiration ?? "") < ($1.expiration ?? "") }) {
+        if let latestExpiration = activeCoupons.max(by: { ($0.expiration ?? "") < ($1.expiration ?? "") }) {
+            expirationLabel.text = "Ισχύει έως " + (latestExpiration.expiration ?? "")
         } else {
             expirationLabel.text = ""
         }