Prompt dialog won't focus nor show keyboard on Android until manually tapping the text input.

# Bug Report

## Problem

On Android, prompt dialog won't focus and show keyboard until manually tapping the text input.

### What is expected to happen?

Automatically show keyboard when calling navigator.notification.prompt.

### What does actually happen?

The prompt view is shown, but without any focus on the input field and without displaying the keyboard.

## Information

There's a PR addressing the issue #132 , but still it doesn't focus in my tests.

### Command or Code

`navigator.notification.prompt(message, promptCallback, [title], [buttonLabels], [defaultText])`

### Environment, Platform, Device

Tested on Android devices running 7.1.1 (Moto G Play) & 9.0 (ZTE Blade V10 VIta).

### Version information

- Cordova CLI v9.0.0 (cordova-lib@9.0.1).
- Android v8.1.0
- cordova-plugin-dialogs v2.0.2
- MacOS v10.15.5

## 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