System background color fix for iOS 13.

Author: tapashmajumder

swift-sdk/Internal/InAppDisplayer.swift

@@ -67,7 +67,7 @@ class InAppDisplayer: InAppDisplayerProtocol {
 
         // htmlMessageVC.view triggers WKWebView's loadView() to start loading the HTML.
         // just make sure that's triggered for the InAppPresenter work correctly
-        if #available(iOS 13, *) {
+        if #available(iOS 14, *) {
             htmlMessageVC.view.backgroundColor = UIColor.systemBackground.withAlphaComponent(CGFloat(backgroundAlpha))
         } else {
             htmlMessageVC.view.backgroundColor = UIColor.white.withAlphaComponent(CGFloat(backgroundAlpha))

swift-sdk/Internal/IterableHtmlMessageViewController.swift

@@ -68,7 +68,7 @@ class IterableHtmlMessageViewController: UIViewController {
         if parameters.isModal {
             view.backgroundColor = UIColor.clear
         } else {
-            if #available(iOS 13, *) {
+            if #available(iOS 14, *) {
                 view.backgroundColor = UIColor.systemBackground
             } else {
                 view.backgroundColor = UIColor.white