Doesn't work properly on Android without cordova-plugin-whitelist

# Bug Report

## Problem

### What is expected to happen?

Plugin opens system browser when invoked, whether or not cordova-plugin-whitelist is installed.

### What does actually happen?

On Android, plugin doesn't open system browser unless cordova-plugin-whitelist is installed. There are no relevant error messages nor anything in the docs to show this dependency. The docs seem to say that the system browser can be opened regardless of whether cordova-plugin-whitelist is installed or not.

### Environment, Platform, Device

Android, Pixel 2 running Android 9

### Version information

```
Cordova:
cordova (Cordova CLI) : 8.0.0
Cordova Platforms : android 8.0.0, ios 5.0.0
Cordova Plugins
cordova-plugin-inappbrowser 3.0.0 "InAppBrowser"
cordova-plugin-ionic-webview 4.0.0 "cordova-plugin-ionic-webview"
cordova-plugin-splashscreen 5.0.2 "Splashscreen"
cordova-plugin-statusbar 2.4.2 "StatusBar"
cordova-plugin-whitelist 1.3.3 "Whitelist"
```

## Checklist

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

Reproduce the report on Android 9 with the listed Cordova and plugin versions, comparing behavior with and without cordova-plugin-whitelist. Trace the plugin's Android browser-launch entry point and verify that the documented dependency and actual behavior agree.

Written by the indexing model from the issue text.