Fixes so that in the web view we are able to navigate different links correctly <Deep> (cocos2d#20266)

Author: deepshah7

cocos/ui/UIWebView/UIWebViewImpl-ios.mm

@@ -244,7 +244,7 @@ - (void)setScalesPageToFit:(const bool)scalesPageToFit {
 
 #pragma mark - WKNavigationDelegate
 - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
-    NSString *url = [webView.URL absoluteString];
+    NSString *url = [[[navigationAction request] URL] absoluteString];
     if ([[webView.URL scheme] isEqualToString:self.jsScheme]) {
         self.onJsCallback([url UTF8String]);
         decisionHandler(WKNavigationActionPolicyCancel);