iOS beforeload event blank page

# Bug Report

## Problem

I tried to open a new window with beforeload event, but the link is not loading. It shows a blank page

``` window.cordova.InAppBrowser.open("","_blank","location=no,beforeload=yes")```

I also tried with `beforeload=get`

### What is expected to happen?

The URL should be loaded properly

### What does actually happen?

A blank page is opened. It works fine without `beforeload=yes`

### Environment, Platform, Device

iOS: 13.0
cordova: 9.0.0
cordova-plugin-inappbrowser: tried with 3.1.0 and `cordova plugin add https://github.com/apache/cordova-plugin-inappbrowser`

Both the versions not working

## Checklist

- [x] I searched for existing GitHub issues
- [ ] I updated all Cordova tooling to most recent version
- [x] I included all the necessary information above

Reproduce the blank page using window.cordova.InAppBrowser.open with beforeload=yes and beforeload=get on iOS 13. Start at the InAppBrowser beforeload handling entry point and compare it with the behavior when beforeload is omitted. Done means the URL loads normally while beforeload remains enabled.

Written by the indexing model from the issue text.