bug: iOS 14 Black screen always on initial app launch prior to actually showing the splash screen [SplashScreen]

This bug is for the SplashScreen plugin described [here](https://capacitorjs.com/docs/apis/splash-screen).

Create an ionic app with capacitor, deploy it on the simulator or physical device:

1) Launch the application
2) Get black screen <-- this was not here prior to iOS 14
3) Transition to the actual splash image

Here is an example of a project where you can reproduce it: https://github.com/Exocomp/demo-ionic-swippable-modal.git

```
Ionic:

Ionic CLI : 6.11.8 (/usr/local/lib/node_modules/@ionic/cli)
Ionic Framework : @ionic/angular 5.2.3
@angular-devkit/build-angular : 0.1000.8
@angular-devkit/schematics : 10.0.8
@angular/cli : 10.0.8
@ionic/angular-toolkit : 2.3.3

Capacitor:

Capacitor CLI : 2.4.1
@capacitor/core : 2.4.1

Utility:

cordova-res : 0.15.1
native-run : 1.1.0

System:

NodeJS : v10.13.0 (/usr/local/bin/node)
npm : 6.4.1
OS : macOS Catalina
```