debug 模式下可以控制 wk 和ui webview切换

review by 枪兵

@@ -524,9 +524,9 @@
     NSString *useWK = [[NSUserDefaults standardUserDefaults] objectForKey:@"USE_WK"];
     if ([useWK isKindOfClass:NSString.class]
         && [useWK isEqualToString:@"N"]) {
-        defaultWebViewEngineClass = @"CDVUIWebViewEngine";
+        webViewEngineClass = @"CDVUIWebViewEngine";
     } else {
-        defaultWebViewEngineClass = @"CDVWKWebViewEngine";
+        webViewEngineClass = @"CDVWKWebViewEngine";
     }
 #endif
     // Find webViewEngine