8355 Consistent button size on orientation change

Previously, if you had the phone in landscape when the “Payment Successful” modal was shown, the two primary buttons would be displayed side by side at different sizes. Changing to portrait and back to landscape resulted in two different sizes showing, which felt strange.

Using the `fillProportionally` option resolves this and leads to a more consistent view in this edge case.

Author: joshheald

WooCommerce/Classes/ViewRelated/CardPresentPayments/CardPresentPaymentsModalViewController.swift

@@ -71,12 +71,14 @@ final class CardPresentPaymentsModalViewController: UIViewController, CardReader
     private func resetHeightAndWidth() {
         if traitCollection.containsTraits(in: UITraitCollection(verticalSizeClass: .compact)) {
             primaryActionButtonsStackView.axis = .horizontal
+            primaryActionButtonsStackView.distribution = .fillProportionally
 
             mainStackView.distribution = .fillProportionally
             heightConstraint.constant = Constants.modalWidth
             widthConstraint.constant = Constants.modalHeight
         } else {
             primaryActionButtonsStackView.axis = .vertical
+            primaryActionButtonsStackView.distribution = .fill
 
             mainStackView.distribution = .fill
             heightConstraint.constant = Constants.modalHeight