Fix all crashes due to lockscreen being setup before app window

[joeljfischer]

Fixes #1258

This PR is ready for review.

Risk

This PR makes no API changes.

Testing Plan

Smoke tests

Original Bug Testing

1. Ensure that if a VC is locked to an orientation, the status bar remains fixed when the device is rotated.

Crash testing

1. App window and root vc are setup, then SDL is setup (standard case if you’re using storyboards, etc.)
2. App window exists but root vc is not setup, then SDL is setup
3. SDL is setup, then app window / root VC is setup
4. (3) but done in the background due to SDL connection, then app is brought to the foreground

Summary

This PR fixes all issues related to the lockscreen being setup before the app window. The previous fix for this issue masked one issue, but there was a second issue as well. This fix should prevent developers from needing to make any change in their code, no matter how their app window is setup.

Changelog

Bug Fixes

• Fix crashes if the app window is setup after SDL.

CLA

• I have signed the CLA