iOS 14 leak conflicts with modal presentation at application launch

[defagos]

If an application using SRG Media Player and presents a modal at startup, this might interfere with the trick used to fix iOS 14 leak (see #93).

[defagos]

A fix attempt has been made on feature/pip-fix-improvement. It seems to work but requires more careful testing and investigation.

[pyby]

It sounds a good proposition.
The dispatch_after still required to apply the workaround.

Tested in iOS 14.2 and 14.3, iPadOS 14.2 and 14.3.
The leak issue is always reproductible with iOS 14.2 and 14.3 on a device (iPhone XS in my case).

@oiledCode should give us his feedback too.