fix: tab bar background under iOS 15 and Xcode 13

Author: pmusolino

WooCommerce/Classes/Extensions/UITabBar+Appearance.swift

@@ -15,6 +15,13 @@ extension UITabBar {
         /// To fix it, we have to specifically set it in the `standardAppearance` object.
         ///
         appearance.standardAppearance = createWooTabBarAppearance()
+
+        /// This is needed because the tab bar background has the wrong color under iOS 15 (using Xcode 13).
+        /// More: issue-5018
+        ///
+        if #available(iOS 15.0, *) {
+            appearance.scrollEdgeAppearance = appearance.standardAppearance
+        }
     }
 
     /// Creates an appearance object for a tabbar with the default WC style.