App is crashing when the screen reader mode is on in IOS.

# Bug Report

**Ionic version:**
[x] **5.x**

**Current behavior:**
App is crashing when voice over mode is on in IOS.

**Expected behavior:**=
App should not be crash when voice over mode is on in IOS.

**Steps to reproduce:**
1. Turn on voice over.
2. Play any video. Double tap on enter full screen. Sometimes It is also occurring when we are trying to play video. It's random issue not occurring every time.

**Related code:**

**Other information:**
We are using npm-plyr (https://www.npmjs.com/package/plyr) for videos.

Because of this issue(https://github.com/ionic-team/cordova-plugin-ionic-webview/issues/378) we are using 2.5.1 version instead of 5.0.0.

**Ionic info:**
Ionic:

Ionic CLI : 6.16.3 (/usr/local/lib/node_modules/@ionic/cli)
Ionic Framework : @ionic/angular 5.6.9
@angular-devkit/build-angular : 0.1000.8
@angular-devkit/schematics : 10.0.8
@angular/cli : 10.0.8
@ionic/angular-toolkit : 2.3.3

Cordova:

Cordova CLI : 10.0.0
Cordova Platforms : ios 6.2.0
Cordova Plugins : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 2.5.1, (and 16 other plugins)

System:

ios-sim : 8.0.2
NodeJS : v14.17.0 (/usr/local/bin/node)
npm : 6.14.13
OS : macOS Big Sur
Xcode : Xcode 12.5 Build version 12E262```