Fixing rounded corners for IAMs

cardViews have their own custom background where corner radius is applied. By setting the backgroundColor you remove the custom background and replace it with a new one that has the new color. To avoid this we should be using the setCardBackgroundColor instead. This changes the color on the custom background instead of replacing it.

Author: emawby

OneSignalSDK/onesignal/src/main/java/com/onesignal/InAppMessageView.java

@@ -396,7 +396,7 @@ private CardView createCardView(Context context) {
         cardView.setClipChildren(false);
         cardView.setClipToPadding(false);
         cardView.setPreventCornerOverlap(false);
-        cardView.setBackgroundColor(Color.TRANSPARENT);
+        cardView.setCardBackgroundColor(Color.TRANSPARENT);
 
         return cardView;
     }