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Avoid crashing the app if the app delegate is written in Swift and doesn't have a window property

Summary:
`window` is an optional property. If an `UIApplicationDelegate` is implemented in Swift and doesn't implement this property, the current code will crash. This was the case for NativeUIPreview's app delegate (used for [iOS Snapshot Test Previews](https://fb.workplace.com/groups/735885229793428/posts/25216903081264969/)):

https://www.internalfb.com/code/fbsource/[e59804301a3c]/fbobjc/Configurations/Buck/NativeUIPreview/AppDelegate.swift?lines=6-10

This diff fixes the crash itself, although we may want to do think about a better way to get the size of the window (eg: using `UIWindowSceneDelegate` instead?).

Reviewed By: LukeDefeo

Differential Revision: D65665540

fbshipit-source-id: 481c76a93

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