[ios] invert credit card holder and expiration fields for manual fallback

Bug: 907087
Change-Id: I3ae8056fcc7ca33eff2a813abf030a2ffeaf8198
Reviewed-on: https://chromium-review.googlesource.com/c/1346149Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Commit-Queue: David Jean <djean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610028}

ios/chrome/browser/ui/autofill/manual_fill/manual_fill_card_cell.mm

@@ -210,8 +210,8 @@ static const CGFloat ExpirationMarginWidth = 16.0;
 
   VerticalConstraintsSpacingForViewsInContainer(
       @[
-        self.cardLabel, self.cardNumberButton, self.cardholderButton,
-        self.expirationMonthButton
+        self.cardLabel, self.cardNumberButton, self.expirationMonthButton,
+        self.cardholderButton
       ],
       self.contentView);