changed reference for the config location to be the shared instance

Author: davidtruong

iterableapi/src/main/java/com/iterable/iterableapi/IterableUtil.java

@@ -285,7 +285,7 @@ static boolean isUrlOpenAllowed(@NonNull String url) {
             return true;
         }
 
-        for (String allowedProtocol : IterableApi.getInstance().config.allowedProtocols) {
+        for (String allowedProtocol : IterableApi.sharedInstance.config.allowedProtocols) {
             if (urlProtocol.equals(allowedProtocol)) {
                 return true;
             }