Ionic 5.x/Screen-Orientation lock does not work on iOS platform

# Bug Report

## Problem
Unable to lock the screen orientation on iOS using the latest version of the ionic framework and the plugin.

### What is expected to happen?

I'm expecting that both the splash screen and my sign-in page is locked into portrait mode on both iOS and Android.

### What does actually happen?

When the app is launched, and the iOS device is in landscape, the splash screen and sign-in page are displayed in landscape.

## Information

- issue observed only on iOS
- issue observed only on iOS 13.3.1

### Command or Code

import { ScreenOrientation } from '@ionic-native/screen-orientation/ngx';

constructor(
.
.
.
private screenOrientation: ScreenOrientation,
.
.
.
) {
.
.
.
this.platform.ready().then(() => {
this.screenOrientation.lock(this.screenOrientation.ORIENTATIONS.PORTRAIT);
});
}

### Environment, Platform, Device

iOS 13.3.1
iPhone XS Max

### Version information

Ionic:

Ionic CLI : 5.4.5
Ionic Framework : @ionic/angular 5.0.7
@angular-devkit/build-angular : 0.803.25
@angular-devkit/schematics : 8.3.25
@angular/cli : 8.3.25
@ionic/angular-toolkit : 2.1.2

Cordova:

Cordova CLI : 9.0.0 (cordova-lib@9.0.1)
Cordova Platforms : ios 5.1.1
Cordova Plugins : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.1.3, (and 11 other plugins)

Utility:

cordova-res : not installed
native-run : 0.3.0

System:

Android SDK Tools : 26.1.1 (/Users/meusercx/Library/Android/sdk)
ios-deploy : 1.9.2
ios-sim : 8.0.2
NodeJS : v10.15.1 (/usr/local/bin/node)
npm : 6.14.4
OS : macOS Catalina
Xcode : Xcode 11.3.1 Build version 11C504

-----

package.json...
"@ionic-native/screen-orientation": "^5.23.0",
"cordova-plugin-screen-orientation": "3.0.2",

## 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

Start by reproducing the sample ScreenOrientation lock call on an iPhone XS Max running iOS 13.3.1 with cordova-plugin-screen-orientation 3.0.2. Inspect the plugin's iOS implementation and verify that the splash screen and sign-in page remain portrait when launched in landscape, while preserving the Android behavior described in the report.

Written by the indexing model from the issue text.